Biology - August 2007

2007-08-09 15:49:44 · 1 answers · asked by snowhite 1

2007-08-09 15:19:33 · 10 answers · asked by Anonymous

2007-08-09 15:11:20 · 1 answers · asked by chie a 1

In a typical human , the following similarities may be quickly discerned:

The corresponding fingers of each hand (on the OPPOSITE side of the body) are roughly identical in length and shape; the same relationship exists concerning the size and shape of the hands, arms, shoulders, ribs, legs, knees, ankles, feet, toes, eyes, ears, and nostrils.

Additionally, the eyes and ears are located in the same relative positions on both sides of the face. Also, the corresponding teeth in the upper and lower jaw are roughly identical in structure.

What accounts for this symmetry?

2007-08-09 13:41:24 · 13 answers · asked by Kidd! 6

and i want to know the advantages to each? i thought we only had a nose

2007-08-09 13:24:44 · 5 answers · asked by Dimitri VanHorn 1

2007-08-09 13:13:50 · 7 answers · asked by Dimitri VanHorn 1

2007-08-09 13:08:09 · 6 answers · asked by simon c 1

If true......that's spooky.

So you would have half-dog and half-humans walking around here????

2007-08-09 12:08:11 · 15 answers · asked by icyhott4urmind 1

2007-08-09 10:34:30 · 2 answers · asked by Anonymous

Describe the phosphorus cycle. Include its reservoir, functions in living systems, and how overloading it is affecting the ecosystem.

2007-08-09 10:28:24 · 5 answers · asked by Anonymous

2007-08-09 10:25:12 · 4 answers · asked by Anonymous

Think of all that you can do with them.

2007-08-09 09:12:32 · 10 answers · asked by galyamike 5

So you have a lot of people on here that have PhDs and are even considered the top in their field. I know a lot of you ask homework questions and could care less, but do you realize that when choose as best, answers that; clearly don't understand what you are asking, or clearly don't understand the subject matter, or are merely repeating what someone more qualified has already said
that you drive away the more qualified people on here and lower the overall quality of answers you get?

Do you care?

I've noticed some of our best answerers have just slowly migrated away as they lose patience. I don't think they care if they get best answer, but when there are no other answers that are even good and they don't get chosen, why bother to keep answering?

2007-08-09 09:08:23 · 8 answers · asked by btpage0630 5

I just turned 14 in june and i am a male asian. I am currently 5'6. When i was 10-11 i barely grew (i was 5'0) then when i was 12 i was 5'3 and when i turned 13 i was 5'6. I went to the doc. and he told me i had osgood schlatter disease and he told me my growth plates were still open.

My dad is 5'7 and my mom is 5'5 however the rest of my family is 5'10 and above. My mom and dads size are like that cuz they did not have the enough nutrients when they were young, the younger bros and sis were taller cuz my parents had to work so my uncles and aunts are way taller.

So these are my questions:
1. Did i have a growth spurt or am i gonna have between my 14-15?

2. Did i reach my adult height?

3. How much do u think ill grow?

4. What do u think will b my adult height?

5. Will i continue to grow?

2007-08-09 09:08:06 · 1 answers · asked by Andrew Reyes 1

a big bug (6cm long) with a sting of 1cm long appeared in my conservatory today. Its in a jam jar and i'm having no luck identifying it. Any ideas where to look? I'd just bought 4 bag of bark chips and laid them in my garden this morning.....could there be a connection.

2007-08-09 08:47:18 · 4 answers · asked by Anonymous

the substantially increased number of people "asking" questions about how evolution has been refuted. I understand it is because of this recent article (http://news.bbc.co.uk/2/hi/science/nature/6937476.stm), but what does this mean?

a) that they don't have any real idea what evolution is all about?
b) that the press does a bad job reporting these finds, sensationalizing them to create headlines?
c) that biology teachers are failing there students?
d) anything else I haven't thought of?
e) all of the above and possibly more?

2007-08-09 08:23:04 · 9 answers · asked by the_way_of_the_turtle 6

Well, I have a colleague... maybe he is ill, but nobody wants to be in the same room...

Bit is it just disgusting or is it harmful to inhale?

2007-08-09 07:50:44 · 14 answers · asked by Anonymous

why is there no temperature change during a change of phase?

2007-08-09 07:21:50 · 3 answers · asked by Anonymous

give an example of heat transfer by conduction, convection, and radiation in your everyday life

2007-08-09 07:19:31 · 2 answers · asked by Anonymous

how does one explain the nature of living things if the second law of therodynamics is correct?

2007-08-09 07:17:04 · 5 answers · asked by Anonymous

I was surfing the web today when I found this and thought I'd share it with all you Yahoo!A users. I just did a google search under "Evolution Problem".

http://www.godandscience.org/evolution/locke.html

I haven't read the books quoted in the essay but after reading the essay I'd highly recommend them. They are "Evolution: A Theory in Crisis" by Michael Denton. And "Darwin's Black Box" by Michael J. Behe.

2007-08-09 06:57:27 · 17 answers · asked by Alien51 2

I'm not going to point these people out, but there are quite a few of them. They say that their book holds the answers to everything and that science is a religion that makes stuff up but can't prove it. What are your thoughts on this?

2007-08-09 06:55:40 · 27 answers · asked by Anonymous

okay....me and my friend were arguing about this...i say they would handle them differently then humans....but my friend says that they would handle it like a human would, or atleast similarly. if you know, would you give me some back up sites....just for like something more concrete. we tried google and found nothing, so we figured we'd ask you all. thanks.

2007-08-09 06:52:25 · 5 answers · asked by Anonymous

2007-08-09 06:51:37 · 18 answers · asked by Anonymous

A. sugar

B. matter

C. energy

D. carbon

2007-08-09 05:21:07 · 12 answers · asked by Neesh 1

This is why I think the theory of evolution should not be taught in school. Darwin had no scientific data to support his theories. Here is a link from Yahoo news about this latest findings

I am interested in all opinions, but please be respectful to others.

http://news.yahoo.com/s/ap/20070808/ap_on_sc/human_evolution

2007-08-09 05:14:05 · 11 answers · asked by Sparkles 7

Over in R&S, a good many of us "drink" every time someone say "Evolution is just a THEORY" or "If we came from monkies[sic] then why are there still monkies[sic]?" If they offer Pascal's wager, we answer with *drink*.

With the new anthropological discover on Yahoo's front page, we are getting too drunk to fight the good fight. Here's on example:

http://answers.yahoo.com/question/index;_ylt=Aivbu3ws1aidJdUpAt7aVwXd7BR.?qid=20070809082836AAr5c0v

Please come help... I can't see straight anymore!

2007-08-09 04:43:07 · 7 answers · asked by ZombieTrix 2012 6

People are being born without wisdom teeth, and theur smalls are slightly smaller.

What will the next change be?

2007-08-09 04:32:20 · 7 answers · asked by Anonymous

Will the population on Answers that keep acting like evolution is a law rather than a theory ignore this evidence and continue to make unfounded claims? Will the schools continue to teach the theory as is?

News clip:
The old theory is that the first and oldest species in our family tree, Homo habilis, evolved into Homo erectus, which then became human, Homo sapiens. But Leakey's find suggests those two earlier species lived side-by-side about 1.5 million years ago in parts of Kenya for at least half a million years. She and her research colleagues report the discovery in a paper published in Thursday's journal Nature.

2007-08-09 04:14:24 · 15 answers · asked by Automation Wizard 6

We have demonstrated for the first time that inhalation of common air pollutants affects the systemic vasculature of humans. Short-term exposure to PM2.5 and O3 at levels that occur in urban environments causes acute conduit artery vasoconstriction without producing immediate alterations in endothelial-dependent or -independent vasomotion. This finding is important because it suggests that alterations in arterial tone may be a relevant mechanism contributing to air pollution–mediated acute cardiac events and because it provides evidence that the observations shown by large epidemiological studies are biologically plausible.1

Relevance of Conduit Artery Vasoconstriction
It is reasonable to suspect that the coronary vasculature may respond similarly to air pollution exposure because brachial and coronary reactivity strongly correlate (r=0.79, P<0.001 for brachial versus coronary FMD).10 Even so, a reduction in coronary diameter of this relatively small magnitude (0.1 mm) would have minimal impact on healthy adults. However, congruent with epidemiological findings that individuals at increased risk for acute air pollution–related cardiac events generally have pre-existing cardiovascular disease, 2 this degree of sudden coronary vasoconstriction could promote cardiac ischemia in those with underlying flow-limiting obstructive lesions or could trigger instability of susceptible plaques.11 Furthermore, the vasculature of patients with coronary risk factors is known to hyper-react to a variety of vasoconstrictors,12,13 which potentially increases their susceptibility for acute cardiac events after air pollution exposure. Additional investigations in the coronary circulation and in high-risk individuals are needed to confirm these hypotheses.

Mechanisms and Mediators of Vasoconstriction
Because this is the first study to investigate the effects of air pollution on the vasculature, a more complete understanding of the pathophysiological mechanisms underlying our observations and the specific pollutants involved requires further investigation. Substantial evidence links increased PM2.5 alone with cardiac mortality.1 However, our initial air pollution exposure was chosen to be PM2.5 plus O3 because this mixture occurs in "real-life" settings. At present, an effect on the vasculature partially mediated by O3 cannot be ruled out. Determinations of the relative importance of PM2.5 versus O3 and specific components in fine particulate matter await follow-up studies now that a meaningful effect of urban air pollution on vascular function has been demonstrated.

Potential biological mechanisms for the vasoconstriction include a reflex increase in sympathetic nervous system activity via stimulation of pulmonary vagal afferents14 or an acute increase in vascular ET release, analogous to cigarette smoking.15 PM2.5 inhalation has been shown to induce systemic inflammation and cytokine production,16 possibly related to free radical activity of components in particulate matter.17 In turn, these have the capacity to enhance vascular ET expression by direct mechanisms or via activation of oxidative stress pathways.6 Indeed, we have previously demonstrated the presence of increased plasma ET levels acutely after PM2.5 exposure.5

In conclusion, alterations in arterial tone and reactivity in response to PM2.5 and O3 exposure is a new arena for future research into the biological mechanisms linking air pollution with acute and potentially chronic cardiovascular events. Further investigations are needed to confirm and extend our findings to the coronary circulation and to subjects with existing heart disease.

2007-08-09 04:03:29 · 1 answers · asked by Anonymous