I am not entirely sure, but i think it would be the respiratory system because plants produce oxygen after taking in carbon dioxide, and that is similar to the human respiratory system. I am not completely sure though. hope this helps!
B. It can cause widespread death
it can also
C. It may seriously impact healthy adults.
flu is caused by a virus (influenza) NOT bacteria
Vaccines are made, but may not necessarily be available for a pandemic right away (takes time to develop).
I believe that the best answer for this question is "gene mutations." Gene mutations can either take place through nucleotide substitutions, which occur when the the sequence of nucleotides are altered. Frameshift mutations can also occur. They involve the insertion or deletion of a DNA molecule's bases. Hope this helps.
At the top of the body of a water, there is a lot of light from the sun, which also means a lot of solar energy. This allows for a fruitful photosynthesis.
In contrast, at the bottom of the water, there isn't as much, or sometimes any, sun light. Because of this the organisms at the bottom of the body of water
<span>D. must rely on other means than photosynthesis
</span>
The tree's life cycle, Because are world is just getting worse and worse so over time tree's will probably live less of a life then they do now.
