Observation is the answer
hope this helps
<h2>Answer</h2>
Spontaneous generation does not support cell theory because
- <u>A. All cells arise from preexisting cells</u>
Correct me if I'm wrong
<h3>#CarryOnLearning</h3>

Hi,
I think that you're missing some options, but here they are (let me know if I'm right!
-A population of wolves was introduced
-The amount of disease in the deer population decreased
-More grass was planted
Now, if the gene diversity decreased, it means that a lot of deer died. This could happen because wolves were introduced -this is the correct answer, and the wolves ate some deer.
The cardiovascular system I think. Hope this helps
Homeostasis is maintained by the respiratory system in two ways: gas exchange and regulation of blood pH. Gas exchange is performed by the lungs by eliminating carbon dioxide, a waste product given off by cellular respiration.