Heart and lungs works hand in hand. Not only that they are close to each other but they also work to make sure that body gets enough oxygen that it needs to live. It is the heart that pumps blood through the body it passes through the lungs. then it is the job of the lungs to supply oxygen together with the blood that heart pumps.
Answer:
That the purple trait is dominant and the purple pea plant has a gene type of PP and the white flower has a gene type of pp
The first choice is correct
B. Crab
is your answer
An crab has an exoskeleton
hope this helps