Science & Mathematics - 28 June 2007

Your teacher wants you to construct a phylogenetic tree of orchids. He gives you tissue from seven orchid species and one lily. What is the most likely reason he gave you the lily?

A) to serve as an outgroup
B) to see if it's a cryptic orchid species
C) to see if the lily and the orchids show all the same shared derived characters (synapomorphies)
D) see if you were paying attention

2007-06-28 10:18:44 · 3 answers · asked by Anonymous in Biology

If so, what makes it weaker?

2007-06-28 10:17:10 · 7 answers · asked by Anonymous in Astronomy & Space

Simplify 4sin2xcos2x. Please explain steps. Thanks

2007-06-28 10:07:21 · 3 answers · asked by Deborah P 2 in Mathematics

I saw this equation yesterday, and was wondering where it came from.

Range = (Vo² sin(2theta))/a
Where range is the change in x
Vo is the initial velocity
and a is the acceleration

Thanks.

2007-06-28 10:06:47 · 3 answers · asked by Anonymous in Physics

solve for Z: Y X
----- = -----
4Z W

HELP!

2007-06-28 10:06:20 · 9 answers · asked by Anonymous in Mathematics

I am an Engineering Student ( B. Tech., from a college in India).
I am good at physics, and the chip-level architectures really rocks my socks. What kind of subjects do I focus on to achieve this aim?
Also, what can I do now to learn more about core architecture at chip-level, and designing it?

2007-06-28 10:02:48 · 6 answers · asked by paritosh1010 1 in Engineering

Whenever I see it on TV they always do it on the spot without any sedative so how do they cut the persons throat open without them moving or anything?

I know its TV and thats why im asking.

2007-06-28 10:00:25 · 9 answers · asked by fred 3 in Medicine

2007-06-28 09:59:14 · 21 answers · asked by Anonymous in Biology

I know how to find the area, but i need help in finding the upper and lower limit? any ideas? please explain thank u very much.
y=x+6
y= -2x
y= x^3

2007-06-28 09:58:22 · 5 answers · asked by ♥stacy♥ 3 in Mathematics

2007-06-28 09:57:13 · 5 answers · asked by Anonymous in Other - Science

It is well known that carbon dioxide is denser than air.
What are some other very dense heavy gases? What is the densest known gas?

2007-06-28 09:56:15 · 7 answers · asked by Jeffrey K 7 in Chemistry

How are uvulas distributed across the Animal Kingdom? Do all humans have them? Do all primates...just apes? Do other mammals have them? Non-mammals?

2007-06-28 09:55:53 · 4 answers · asked by rorydiva 1 in Biology

Perform the indicated operations.
[(1.3x3 + 7.3x2 + 4.9) + (6.2x - 2.4)] - (3.4x2 -x - 9.3)

1.3x3 + 10.7x2 + 5.2x - 6.8
12.4x6 + 11.8
1.3x3 + 3.9x2 + 6.2x + 11.8
1.3x3 + 3.9x2 + 7.2x + 11.8

2007-06-28 09:50:32 · 4 answers · asked by Anonymous in Mathematics

What is the most interesting book about mathematics that you have read? Why is it interesting?

What books about mathematics would you recommend a person to read if he or she is at pre-university level?

2007-06-28 09:48:22 · 12 answers · asked by Anonymous in Mathematics

2007-06-28 09:45:40 · 8 answers · asked by nicky v 1 in Earth Sciences & Geology

2007-06-28 09:42:37 · 1 answers · asked by Mary L 1 in Earth Sciences & Geology

2007-06-28 09:35:40 · 22 answers · asked by Anonymous in Astronomy & Space

animals
bacteria
plants
bacteria and plants
animals, bacteria, and plants

2007-06-28 09:27:15 · 3 answers · asked by Shawn 2 in Biology

I heard that cadavers are being taken out of the curriculum in some medical schools. Is this true?

2007-06-28 09:21:44 · 11 answers · asked by Beautiful bee 1 in Medicine

birds
amphibians
cartilaginous fish
bony fish
reptiles

2007-06-28 09:19:32 · 2 answers · asked by Shawn 2 in Biology

2007-06-28 09:16:46 · 5 answers · asked by pirloaga n 1 in Zoology

I am building funhouse type cars that are powered by a 1200 watt electric motor that is rated at 32 amps. I want to install a roller switch that will turn the car off when it comes into the loading dock and turn it back on when the car is shoved into the ride. All the roller switches I have found are 15 amps max. What is the safest, cheapest way to do this?

2007-06-28 09:16:08 · 3 answers · asked by Anonymous in Engineering

Hi.
When you draw 4 cards from it can be computed by 52C4 but how do you use the same notation to compute the probability of getting some number on a dice? I know the chances are 1/6 but how do I use the C notation.
Thank you.

2007-06-28 09:14:33 · 5 answers · asked by F 6 in Mathematics

2007-06-28 09:04:36 · 13 answers · asked by mikey 3 in Astronomy & Space

in terms of electricity

2007-06-28 09:02:43 · 3 answers · asked by Anonymous in Mathematics

2007-06-28 08:58:34 · 3 answers · asked by robinett420 1 in Engineering

F(x)= (1+sinx) / (cosx)

Is it (– 1) / ( 1+cosx)

2007-06-28 08:56:45 · 4 answers · asked by chimstr 1 in Mathematics

2007-06-28 08:56:14 · 5 answers · asked by Alexander 6 in Physics

there are so many birds that can mimic humans,
however monkeys can't...!

since these are our "closest" relatives i would have thought they would pick it up easy!

2007-06-28 08:51:56 · 27 answers · asked by Anonymous in Zoology

IF a study was conducted to see if graphite and carbon fiber had the same tensil strength which would be the stronger of the two. They both use the same resin and are both preimpregnated with the resin and cooked on a tool at 70 psi of nitrogen pressure in an autoclave for two hours at 350 degrees. Which is stronger? Plus they both have the same weave pattern, which is a plain weave.

2007-06-28 08:50:19 · 2 answers · asked by Anonymous in Other - Science