Which branch of science studies the chemical subentance in nature

I am going to say chemistry.

Explanation:

Hope that helps, let me know if it does or not.

x would be the most and the least would be y because there are more fruit   and seeds than flock z has insects

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.