Blog #3

Explain what microevolution is? What are the three ways that variation occurs?

Microevolution accepts changes within a particular organism while remaining the same organism. For example, a red back frog can change into a blue back frog over time, but no matter what they are still frogs. Microevolution is just the way animals get different traits by evolving but they still remain the same animal.

the three way variation can occur are :

Mutations alter the order of bases in the nucleotides of DNA. Mutations are likely to be rare and most mutations are probably harmful, but in some instances the new alleles can be favored by natural selection.

Independent assortment (recombination of chromosomes that occurs during sexual reproduction)

And the Crossing over that happens during meiosis

http://answers.yahoo.com/question/index?qid=20090920160125AA1tK3U

Blog #2

Why is fossil record hard to interpret?

All fossils are hard to determine when the animal was actually alive. fossils are very hard to interpret because of how old they are. They date back to millions of years. This makes it so hard to determine a date in history when the fossil is from. The bones of the animals get so badly damaged by rain and dirt, that after a few thousand years its almost impossible to even make out what the bone is. So can you imagine how hard it is to date a fossil of an animal that millions of years ago?
http://www.thedarwinpapers.com/oldsite/number5/darwin5.htm

   

blog #1

Why is evolution a theory and not a law?

A law is a fact that is observed to be universally true. Laws are "observed" to be true, not "proven" to be true. And a law is a single short statement ... usually in the form of an equation.

A theory is an explanation for observed facts. A good theory explains many facts. The more facts it explains, the more we say it has evidence ... which is why we say that evolution is one of the strongest theories in the history of science ... it explains thousands of facts. And a theory is a body of many statements ... and a theory can expand and grow with more details as we find more facts that it explains.
http://answers.yahoo.com/question/index?qid=20080704004950AA5hwcZ

evolution cannot be proven to be a law because there is no live evidence, there are only the remains of the evidence. To make it a law, there would have to be dinosaurs and those different types of animals walking around today. but, all we have are their fossils, and remains.