Organisms that live in similar environments, such as the ocean, often have similar adaptations. This is often due to A. convergent evolution
B. coevolution Proton
C. gradualism
D. sexual selection ​

 A.

Explanation:

Convergent evolution is the independent evolution of similar features in species of different periods or epochs in time.

thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.

trachea, alveoli, lung capillaries, arteries