What is a blastocyst
a. a sperm fused with an egg
b. a structure that nourishes the fetus
c. a ball of about 100 cells
d. an unfertilized egg

The answer is C

Explanation: it is the answer with 100 (apex)

answer by yourhope:

answer is

human impact on the environment can be seen in the deterioration of the !

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above statement is not a true statement about the open ocean because the open ocean has low levels of nutrients. most of the photosynthetic activity on earth occurs in the open ocean within the photic zone. organisms in the deep ocean are exposed to frigid temperatures and total darkness but it does not begin at the low-tide mark.