Describe how crossing-over, independent assortment, and random fertilization lead to genetic variation.

What substance is the most acidic. lemon juice. tomato juice. sodium hydroxide. water

Explain how paleontologists use trilobite fossils as index fossils for various geologic time periods.

Which statement describes how favorable traits in a population relate to natural selection? they are the only traits that ever exist in the population. they build in the population over time. they are rarely passed on to offspring. they are found only in a few individuals within the population.