Answer:
The placenta serves as an interface between the mother and the developing fetus and has three main jobs: Attach the fetus to the uterine wall. Provide nutrients to the fetus. Allow the fetus to transfer waste products to the mother's blood.
Explanation:
c
plants
because animals can maybe poop or pee on the water .and also people are the same too.so plants are the least likely to cause water pollution
a
B is your answer!!!
No specific explanation...
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