Answer:
"Growers using organic soils will never concern themselves with supplying oxygen to their plants; however, hydroponic growers like me must be well versed in the science of dissolved oxygen (from here on out called DO). While most crops seem to prefer about 9 PPM DO, some crops like lettuce have demonstrated little to no difference in fresh weight or dry weight when grown in DO levels ranging …"
Explanation:
Answer: Pollution, climate change, habitat loss, or invasive species
A is for sure an answer , i’m pretty sure C -ISNT- an answer . for b and c, someone can comment on it.