explain what mircoevoultion is? what are the threee ways variation occurs?

Microevoltion is simply a change in gene frequency within the population. Between one generation the next the frequency of gene pesticide resistance of population of crops pest increase. A change might come of because of natural selction favored the gene. Some nonrestiant genes mutated to the resistant version. There are three ways variation occurs when mutation alter the order bases of the nucleotides in DNA. Mutations are rare amd most mutations are harmful, but in some instances the new alles can be favored by natural selection. This can also happen during meiosis.
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why is a fossil record hard to interpret?

There are a lot of reasons why a fossil record is hard to interpret . A fossil record might be hard to interpret because the animal is small. The interpretation is hard because of the painstaking sand that is covering the  fossil. When interpreting a fossil paleoblogists have to find all the fossils of the animal. Sometimes it can be hard to interepret the fossils and sometimes it can be easy. But whenn u interpret a large animal it can take a very long time but it is still hard because u have to make sure that u don't break the fossil. To be no value in interpreting patterns and trends of history of life and that we should except relatively complete record of details of evoluionary transtions within most lineages.

Why is evoultion a theory not a law?

Evolution is a theory not a law because Scientists define evoultion as a change gene pool that population changes over time. This rate of evolution is all that is required to produce the diversity of the living things as common ancestors. The thoery of evolution says that life originated, and evolution proceeds by random chance. Evolution is a thoery not a law because in science a theory is a well explained explanation for some aspect of the world. Evoulion is a well substained fact because it has been observed and it explains the sequence and arrangement of fossil record. As well as scientific thoery descent with modication species share a common ancestor. Theres a fact of evolution that species there is a variation within one kind of animal.