Im stuck on the first 2 answers

it's anything that aren't producers and consumers.

explanation:

you've got to be clear on what "this" is

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