Hi!
The answer should be C) hydrogen
Hope this helps!
-Payshence xoxo
Hi there!

Plant cells contain a cell wall which causes them to be more rigid in structure, whereas animal cells only contain a cell membrane.
In addition, plants contain chloroplasts, an organelle that allows the cells to undergo photosynthesis to produce energy. Animal cells, on the other hand, only contain mitochondria for cellular respiration.
The greenhouse effect traps heat near the surface and raises the temperature, just like a blanket. :)
Answer:
d. all of the above
Explanation:
Geographic means anything to do with the terrain or land. Isolation can happen for any amount of time, so you never know what the new population might be.