What would be the possible offspring of a heterozygous black hen and a homozygous white rooster if black feathers are co-dominant to white?

Which of the following will not cause mass extinction? a. drastic change is weather b. geological change c. both a and b d. none of the above

2. if scientists identify an animal with bilateral symmetry and no segmentation, which phylum can it definitely not belong to? a. roundworms b. annelids c. mollusks d. flatworms

What were the main components of earth’s earliest atmosphere? oxygen and ammonia hydrogen and helium oxygen and nitrogen hydrogen and nitrogen