Which change would create a new ecosystem? A) a lake freezing over

B) a dam flooding a valley

C) an introduced species

D) a yearly migration

Blood has traveled from the heart to the toes. which describes the next step of the circulation process?

Many farmers prefer cattle without horns because it is safer for their herds. the allele for no horns (n) is dominant to the allele for the presence of horns (n). a farmer mates a male with horns to a heterozygous female without horns. what is the chance that the offspring will have horns?

Pl which diagram illustrates prophase?