Answer:
Variations are caused by mutation. random mating between organisms.
Explanation:
The answer is A because the heart pumps blood from the heart through pulmonary artery that is low in oxygen and high in carbon dioxide concentration, to the lungs.
The answer to this question is b carpel that's the answer
Answer:
A
Explanation:
Somatic cells are diploid (46 chromosomes)
Gamete cells are haploid ( 23 chromosomes)
The lining attached to the lungs is called the visceral pleurae.