Organism and organ system
In my mind it is C, because A looks a bit too suspicious too me, because we already had a lot of crops, but now al lot of the things we use are plastic, such as plastic cups, chairs, and tables etc.
My final answer is C.increased use of plastics.
Hope this helps!
We have 20 different amino acids in our bodies.
I think the answer your looking for is smooth muscles and cardiac muscles. They only muscles that can be voluntarily controlled is skeletal muscles. Let me know if this is what you're looking for:)
