Early during development, organisms as diverse as a human, a mouse, and a bat can appear indistinguishable. All of their embryos look nearly identical,

suggesting that

this is a coincidental resemblance between them

during development, humans go through stages of being a mouse and a bat

these very different species have a shared ancestry with all mammals

similar structures have developed because of convergent evolution

20 21 22 23 24 25 26

27 28 29

Next

In which situations is the principle of cross-cutting relationship useful in determining relative age?

Based on the law of dominance, we would expect percent of the offspring from this cross to have large teeth.

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?