Vertebrates share similar embryological developmental stages as depicted in the illustration above. certain structures during development appear on all vertebrates. which structure does not appear on all vertebrate embryos?

What would be the result if crossing over did not happen during meiosis in humans? a. there would be less genetic variation in humans. b. parents would be more likely to look like their children. c. the human population could not reproduce. d. children would have more chromosomes.

Which law represents a balanced chemical equation?

What kinds of molecules can pass through the cell membrane without any problem?