Aresearcher is trying to construct a molecular-based phylogeny of the entire animal kingdom. assuming that none of the following genes is absolutely conserved, which of the following would be the best choice on which to base the phylogeny? a) genes involved in chitin synthesis
b) collagen genes
c) genes involved in directing segmentation development
d) genes involved in eye-lens synthesis

Humans are believed to have evolved in coastal regions in east africa. the region had an abundant supply of fish for early humanoids to eat. when scientists analyze the fads gene they see an interesting pattern. people whose families have lived in this area of east africa for generation show a high level of diversity in alleles for the fads gene. conversely, people whose families had migrated inland a moderate distance from sources of fish showed a much lower diversity for fads gene alleles. additionally, the fads alleles found in people whose family has lived inland for generation are almost all gene alleles which produce fads proteins with a high level of function and activity. how do anthropologists explain this?

Why are fossils not found in igneous rocks? igneous rocks are made from cooling of lava or magma. igneous rocks are found too deep underground. igneous rocks are too dark in color to contain fossils. igneous rocks are too dense to contain fossils.

The third stage of cellular respiration is (2 points)