Answer:
d. consumers, heterotrophs
Explanation:
I think the correct answer among the choices is option B. When antibodies are produced by lymphocytes, the body is conducting adaptive immunity. It is also referred to as acquired immune system. Adaptive responses are carried out be the white blood cells.
I'm assuming the answer would be greenhouse gas.
Greenhouse gases are those that trap infrared radiation (from the sun) and contribute to the greenhouse effect.
I would say man made but not to sure with out answer choices..
