Biology - December 2007

Sexual dimorphism is the difference in size or appearance between a male and female of that species.

2007-12-12 10:08:36 · 2 answers · asked by Anonymous

cigarettes smoke is mostly oxygen, CO2 and nitrogen. The rest contains at least fifty five different chemicals identified as cancerogenic. When these cancerogenic enter the bloodstream, enzymes convert them to a series of chemicals that are easier to excrete. Therefore do you know one mechanism by which smoking cigarettes causes cancer?
Please answer only if you know the right answer.
Thank you very much.

2007-12-12 09:39:34 · 1 answers · asked by assoloperpiano 2

Why does only one of these (which one?) lead to adaptations?
Thanks for your help!!!! Best answer gets 10 points!!!!

2007-12-12 09:29:25 · 4 answers · asked by R & L C 2

2007-12-12 09:15:11 · 6 answers · asked by snuggleslvr15 1

2007-12-12 09:14:34 · 5 answers · asked by Anonymous

2007-12-12 09:09:09 · 3 answers · asked by Anonymous

I would like to hear your answers...without contradicting yourself. Ready set go.

2007-12-12 07:52:08 · 11 answers · asked by jbsjunkie707 1

How far back, historically, do theories about inheritance date

(in the passing parents passing genes onto child way)

2007-12-12 04:20:26 · 2 answers · asked by sand_illusions 4

Two requirements for natural selection are?

fitness and adaptation
heritability and fitness
heritability and variation ( I chose this )
fitness and variation

Which of the following best describes evolution by natural selection as we now understand it?

Survival of the fittest
Only the smartest and strongest survive
Change in the frequency of traits over time ( I chose this)
Random changes in traits over time

If we cut the tail off a mouse, then breed it with a normal mouse with a full tail, we would expect?

All the offspring will have no tails
None of these answers are correct
Half of the offspring will have tails, the other half will not
All the offspring will have tails ( i chose this)

Natural selection will increase the frequency of a trait in a population if that trait?

is maladaptive
is highly fit
increases organisms' chances of survival only
increases organisms' chances of survival and reproduction ( I chose this)

2007-12-12 04:16:31 · 2 answers · asked by jeniferrrr 1

To me it seems that the organ of sight in its incipient form must have been inseparable from the neural network of the organism in which it developed.

The first organism to develop light-sensitive cells would have no use for them whatsoever if it didn't also have a region of its brain that was conditioned to interpret the data received. That implies that at least two very rare and complementary mutations must have randomly coincided in the same organism for its new apparatus to be of any benefit to its survival.

This seems very unlikely to me, so would you say sight in a very primitive form was somehow originally inseparable from that which processed the data, and from that point gradually evolved into eyeballs and the visual cortex etc?

2007-12-12 04:03:09 · 11 answers · asked by Anonymous

I have a review guide for a test, and there's one page that I cannot seem to get at all. I've looked through my notes, book, and even on the internet and can't find anything. So my last hope is asking the questions on here. I know there's a lot of questions but I'd appreciate it so much if you could help!!

Choices:
A. Ethmoid B. Frontal C. Hyoid D. Lacriminals
E. Mandible F. Maxillae G. Nasals H. Occipital
I. Palatines J. Parietals K. Sphenoid L.Temporals
M. Vomer N. Zygomatic

1.Bridge of Nose
2.Posterior part of hard palate
3.Much of the lateral and superior cranium
4.Most posterior part of the cranium
5.Anterior part of hard palate
6.Superior and medial nasal conchae formed from its projections
7.Site of mastoid process
8.Site of sella turcica
9.Site of mental foramen
10.Site of styloid process
11.Middle ear found here
12.Nasal Septum
13.Bears an upward protrusion, the "c o c k 's comb" or crista galli
14.It's condyles articulate with the atlas

2007-12-12 03:26:33 · 2 answers · asked by Anonymous

Why is it that without our sense of smell, we can only taste the bland basics (sweet, sour, bitter, salty, and umami)?

2007-12-12 02:30:19 · 8 answers · asked by Gemma 2

What is the implication if a drug has a different protein binding value in different people???

2007-12-12 02:20:58 · 2 answers · asked by Anonymous

2007-12-12 02:14:26 · 6 answers · asked by Anonymous

http://www.reuters.com/article/healthNews/idUSN1043228620071210?feedType=RSS&feedName=healthNews&rpc=22&sp=true

Here is the "latest" rule to evolution! We humans have been "suffering" from the "breakneck" speed of the evolution of "our" species.

Months ago saw me asking the Y!A collective why oppossums haven't developed wings or longer legs in an attempt to evolved themselves out of the plight of becoming road pizza.

ALL the answers seemed to explain to me that the evolution of a particular species takes thousands of millenia to occur.

Well, apparently, these people were WRONG! Any of you have a better explanation for this story?

2007-12-12 02:14:06 · 3 answers · asked by ? 6

I am reading "The Intelligent Universe."

On page 40, there is a brilliant illustrated display of examples showing how evolution is impossible--if I understand correctly.

Now I'm up to page 91, where he says that our forefathers arrived in a meteor shower in a microbial state, and that we have since evolved therefrom--if I understand correctly.

Is he going to reconcile all this?

2007-12-12 01:54:12 · 3 answers · asked by suhwahaksaeng 7

2007-12-12 01:16:00 · 2 answers · asked by aasha p 1

They found a friend of mine that had been dead for a week or more sitting on the couch watching T.V. I was told that I didn't want to go see the body. Things like that do not bother me. Would there have been a smell? There were two cats in there with her all this time. What exactly would she look like & can you go see them at the City Morgue?

2007-12-11 23:25:55 · 4 answers · asked by J.J. 1

Not so much explaining as actual problem solving. For example,

If someone were to tell you that there was a population of 100 people, 98 of them having attached earlobes (rr). What would be the:
P:
Q:
f(Homozygous Dominant):
f(Homozygous Recessive):
#(Homozygous Dominant):
#(Homozygous Recessive):

Thank you, a definite 10 points for a valid answer.

2007-12-11 18:03:18 · 1 answers · asked by thnbgr1 1

2007-12-11 17:58:13 · 4 answers · asked by Anonymous

2007-12-11 17:52:51 · 3 answers · asked by .......... 4

I'm 5'3" and I really want to be taller. I don't think I'm tall enough. But I'm already 18, can I still grow taller? Thanks for all the answers.

2007-12-11 17:20:25 · 6 answers · asked by laidbacktionist 2

2007-12-11 15:57:09 · 2 answers · asked by Anonymous

2007-12-11 15:38:30 · 5 answers · asked by Amanda K 1

a. gas exchange
b. feeding
c. water elimination
d. both feeding and gas exchange
e. all of these

2007-12-11 15:36:02 · 3 answers · asked by brian 2

a. cnidarians
b. sponges
c. jelly fish
d. flatworms
e. placazoans

2007-12-11 15:34:09 · 8 answers · asked by brian 2

a. spores
b. cuticle
c. xylem
d. sporophytes
e. pollen

2007-12-11 15:31:01 · 3 answers · asked by brian 2

2007-12-11 15:29:17 · 2 answers · asked by Desperate 1

I'm writing an essay for my Anatomy and Physiology class and I don't know where to begin. I have to write about three reasons why the study of A&P can be seen as valuable to our culture today, especially in light of technology. I just need some ideas to get the ball rolling. Thanks!

2007-12-11 15:03:32 · 2 answers · asked by Mel 2

2007-12-11 15:02:28 · 12 answers · asked by jay r 1