Science & Mathematics - 4 January 2007

7(4w - 3) - 25w

2007-01-04 06:36:09 · 8 answers · asked by Anonymous in Mathematics

FOSSILS:
Are the remains of creatures which existed long ago. Fossils range from thousands of years to many millions of years in age. The earliest fossils date from around 600 million years ago, however recent reports suggest bacteria may have existed up to 3 billion years earlier. To put this in context, the dinosaurs became extinct just 65 million years ago.
Not all former life was preserved as fossils; in fact the vast majority simply vanished without trace. The most likely materials to survive fossilisation are the hard parts such as shells and objects which in life were constructed from resistant materials, such as Coral. In order for softer materials to survive, the conditions must be extremely favourable.
Fossils come in a variety of sizes, from minute traces to large skeletons. Trace fossils are clues to former life, they result from the activities or presence of creatures and plants. Examples of these traces include footprints, burrows and root tunnels. At the larger end of the scale, fossils also include bones, the largest of which belong to the dinosaurs, which existed between the Triassic and Cretaceous periods.
fossils include:
- Shells
- Bones and teeth
- Fossilized footprints and burrows
- Leaves and seeds
- Tree trucks and branches
- Fossilized animal droppings
- The examples used are:
- An ammonite:
A shelled creature that lived in the seas around 150 million years ago. (To learn more about Ammonites you can cheek ammonite page).
- The Trilobite :
is hard-shelled, segmented creatures that existed over 300 million years ago in the Earth's ancient seas,
(To learn more about trilobites you can cheek trilobites page).
-Orthoceras:
Fossils are dated back to the Silurian Age 400 + million years ago and are the earliest recognizable animals
(To learn more about orthoceras you can cheek orthoceras page).http://www.geocities.com/moroccofossils

2007-01-04 06:35:44 · 5 answers · asked by moroccofossils 1 in Earth Sciences & Geology

the vapour pressures of a liqiud depend on the intermolecular forces??????

2007-01-04 06:34:38 · 3 answers · asked by Hally berry 3 in Chemistry

2007-01-04 06:33:37 · 19 answers · asked by Anonymous in Zoology

mean by saying that involves a danymic equilibrium???????

2007-01-04 06:33:06 · 1 answers · asked by Hally berry 3 in Chemistry

how many cubic centimetres of a solution of hydrochloric acic, of concentration 2 mol dm-3, are required to react completely with 50cm3 of a solution of barium hydroxide that contains 68.4 g dm-3?

2HCl (aq) + Ba(OH)2 (aq) ==> BaCl2 (aq) + 2H2O(l)

the answer given is actually 20 cm3, but i just dont know how to get to that, so can you show all the steps of your working out of how to get to that answer. thanks

2007-01-04 06:32:22 · 2 answers · asked by b2606 1 in Chemistry

6X^2Y^3 + 9X^2Y^3/
3X^2Y^2

2007-01-04 06:32:09 · 7 answers · asked by ruben c 1 in Mathematics

an impuirty have on freezing point of a pure liqiud ?????

2007-01-04 06:31:33 · 2 answers · asked by Hally berry 3 in Chemistry

2007-01-04 06:30:35 · 18 answers · asked by Anonymous in Engineering

What does the symbol "sign" stand for ?
ex, G=sign(D), where G and D are vectors or Matrices...

2007-01-04 06:30:33 · 3 answers · asked by Ramy E 2 in Mathematics

on a molecular level as a liquid is colled to it's freezing point

plz asap!!!!!!!

2007-01-04 06:30:24 · 1 answers · asked by Hally berry 3 in Chemistry

in degrees of the smallest angle in the triangle is

a)10 b)20 c)30 d)40 e)45

Please Show your work.

9)In the base 10 number system, the number 526 5 x 10^2+ 2x10+6. In the land of Oz, numbers are written in base r. Lloyd purchases a car for 440 unites. He gives the salesman 1000 units and receives 340 unites in change. What is the base r?

a) 4 b) 5 c)6 d)7 e)8

Please show your work.

Thanks

2007-01-04 06:30:15 · 3 answers · asked by Anonymous in Mathematics

2007-01-04 06:27:23 · 7 answers · asked by zebbie g 2 in Zoology

2007-01-04 06:26:50 · 8 answers · asked by Joyce D 2 in Weather

2007-01-04 06:26:29 · 15 answers · asked by akingsada 1 in Geography

Let me start by saying that I am Christian, so you know where I'm coming from.

Will we ever be capable of creating life? From a religious point of view we would think we can't, because this ability is generally associated with a being superior to humans. But there has been progress in testing what we think were the conditions of early Earth that allowed life to be created from inanimate matter. So, based on what you know about investigations on the origin of life, will we ever be successful?

2007-01-04 06:26:28 · 13 answers · asked by Fxer 2 in Biology

5 + (6 + 7) = 5 + (7 + 6)

4 * (3 + 2) = (3 + 2) * 4

2007-01-04 06:26:12 · 5 answers · asked by ruben c 1 in Mathematics

2007-01-04 06:25:06 · 6 answers · asked by Anonymous in Earth Sciences & Geology

5 (6 7) 5 (7 6)

4 (3 2) (3 2) 4

2007-01-04 06:24:47 · 2 answers · asked by ruben c 1 in Mathematics

2007-01-04 06:22:51 · 24 answers · asked by Anonymous in Engineering

i dont think it was possibile that armstrong landed on the moon in 1969. and that is was infact a lie. what do you think?

2007-01-04 06:22:46 · 21 answers · asked by Anna 2 in Astronomy & Space

earth.math.

2007-01-04 06:22:18 · 13 answers · asked by Bibin A 2 in Astronomy & Space

Or are they just placebos - if you have faith in the Dr and the tablets they will work and vice versa. I have been through about six different antidepressants (as well as ECT) and nothing works. I can't see any hope in the medical profession.

2007-01-04 06:21:10 · 18 answers · asked by Anonymous in Medicine

2007-01-04 06:16:31 · 5 answers · asked by Giggly Giraffe 7 in Weather

2007-01-04 06:14:15 · 6 answers · asked by A Jk Original 3 in Biology

Thanks for the answer to the previous question.

Part 2 Question: Like Humans, many bacteria also need oxygen to survive. The oxygen demand for bacteria is
D(of O2)=10(mc)((dmb) / dt) [litres per hour]
*c and b and bases of m

What is the oxygen demand after five days??

The link to the previous question with the rest of the information is here:

http://answers.yahoo.com/question/index;_ylt=AqnKeOOv1wqAWaPFQEadNbPzy6IX?qid=20070104071802AAVf8gs

2007-01-04 06:14:07 · 1 answers · asked by hap17 1 in Mathematics

2007-01-04 06:13:50 · 9 answers · asked by Isabelle06 4 in Mathematics

There are very few things to look at while you are standing at the urinal, especially if you adhere to the rules of men's restroom etiquette. So one finds himself pondering the wall tile pattern, the pen scribbles in the grout, the ceiling, or the optimal stream pattern to reduce splash. These are, for the most part, rather dull and non-upsetting things to think about while doing your business. So why, WHY, must the manufacturers for urinal connectivity pipes put such an unusual statement on the very place where your gaze is most likely to fall? What does it mean? What are they asking to turn, and why would it be loose? If loose, would it make a lot of noise? Wouldn't it leak all over the place? I can't take it anymore!

2007-01-04 06:10:18 · 3 answers · asked by Mr. Hoke 1 in Engineering

If one-half of one integer is subtracted from three-fifths of the next consecutive integer, the difference is 3. What are the two integers?


I would guess that I would set up this equation as 1/2 - 3/5 = 3
But I am lost after that , and I am not even sure thats how I should set it up. Help !

Also I need help with this problem. It is the well know "a train taveling a such and such speed equation" THANK YOU

A passenger train can travel 325 miles in the same time a freight train takes to travel 200 miles. If the speed of the passenger train is 25 mi/hr faster than the speed of the freight train, find the speed of each.

2007-01-04 06:08:25 · 1 answers · asked by CookFrNW 3 in Mathematics

X / X-2 - x +1 / x = 8 / x(squared) - 2x

Solve for X

I am lost on how to complete this problem. I need help. I couldnt figure out how to write x squared with the small 2 so I typed it instead. Thanks ! :)

Also I am stumped on this problem as well,

5/ x+6 + 2/x(squared) + 7x + 6 = 3 / x + 1

These are all fractions just incase it appears confusing. I am supposed to write this equation in simplest form. Your help is greatly appreciated !!!!

2007-01-04 06:03:48 · 3 answers · asked by CookFrNW 3 in Mathematics