Molluscs. hope this helps!
They get runoff into water sources which can be injested by fish which can be injested by birds or any animal who eats the fish or drinks the water including us!
Answer:
Cyanobacteria were photosynthetic and slowly changed the earth's atmosphere from CO2 rich to O2 rich. Photosynthetic cyanobacteria evolved by 3.5 billion years ago and greatly modified earth's atmosphere.
Endocrine plays an important role in the regulation of metabolism, reproduction, water balance, and many other functions. I needed to type a lot but the answer is endocrine.
