B. Healthier ecosystems. If you're talking about benefits, this is the only positive on this list. The others are listing the difficulties or downsides.
A) moves substances across the cell membrane
Answer:
D
Explanation:
Plants take their nitrogen from the soil which would have been converted by bacteria ...not straight from the atmosphere
<span>If Noam chooses a filter, it might be more effective than a screen. After using it for a while, though, he will have to replace it, which could be expensive. A screen might be less effective, but it can be cleaned instead of replaced.</span>
