Answer:
Chemicals that are secreted from antigen-presenting cells then activate helper T cells.
Explanation:
When new oceanic crust is made, it spreads out, taking up space. Scientists did not understand how new crust was not increasing the size of Earth.
The opposite of photosynthesis is aerobic respiration
Answer:
The water which is released back to the lake contains thermal energy ie heat energy from cooled engines therefore bringing thermal pollution
I think the answer is other organisms, as it is the only living option I see in your post.
