Which chemical is an enzyme that adds nucleotides to a new strand of dna during replication

Which plant has a visible leaf modification that will it conserve water in extremely dry environments?

Building glycogen from glucose molecules is an example of what

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.