Life Science Questions? on Evolution?

Question

How do fossils provide evidence for evolution?

How is radioactive dating used to interpret the fossil record?

List five examples of evidence that support the theory of evoltion ?

its not cheating or my homework its for a project

Answer 1

Fossils show that life forms have changed over time, and radioactive dating shows the times at which the earlier forms lived. The theory of evolution (now a proven fact) is supported by both fossil and genetic evidence; you can pick almost any species you please and show its differences with earlier species. The development of the horse, shown by fossils starting with Eohippus (the Field Museum in Chicago), is a nice example.

Answer 2

A-Abrupt appearance of animals, Plants appear abruptly, too., Animals unchanged. , Fossilization requires very special conditions. , check this- http://www.christiananswers.net/q-eden/edn-c006.html

B-Determining the age of a rock involves using minerals that contain naturally-occurring radioactive elements and measuring the amount of change or decay in those elements to calculate approximately how many years ago the rock formed. Radioactive elements are unstable. They emit particles and energy at a relatively constant rate, transforming themselves through the process of radioactive decay into other elements that are stable - not radioactive. Radioactive elements can serve as natural clocks, because the rate of emission or decay is measurable and because it is not affected by external factors.


About 90 chemical elements occur naturally in the Earth. By definition an element is a substance that cannot be broken into a simpler form by ordinary chemical means. The basic structural units of elements are minute atoms. They are made up of the even tinier subatomic particles called protons, neutrons, and electrons.

Radioactive isotopes are useful in dating geological materials, because they convert or decay at a constant, and therefore measurable, rate. An unstable radioactive isotope, which is the 'parent' of one chemical element, naturally decays to form a stable nonradioactive isotope, or 'daughter,' of another element by emitting particles such as protons from the nucleus. The decay from parent to daughter happens at a constant rate called the half-life. The half-life of a radioactive isotope is the length of time it takes for exactly one-half of the parent atoms to decay to daughter atoms. No naturally occurring physical or chemical conditions on Earth can appreciably change the decay rate of radioactive isotopes. Precise laboratory measurements of the number of remaining atoms of the parent and the number of atoms of the daughter result in a ratio that is used to compute the age of a fossil or rock in years.

C- check this web- http://www.agiweb.org/news/evolution/examplesofevolution.html

Answer 3

Ohhhh....my head hurts...Are you trying to get me to do yer homework, young lady?

Answer 4

hmm, that sounds a lot like cheating on homework, and we wouldn't be doing that, now would we?

Answer 5

i agree with the other guy..unless ur not doing hw...