Question

What are the changes that take place from zygote to foetus​

Answer 1

Answer:

First, the zygote becomes a solid ball of cells. Then it becomes a hollow ball of cells called a blastocyst. Inside the uterus, the blastocyst implants in the wall of the uterus, where it develops into an embryo attached to a placenta and surrounded by fluid-filled membranes.

Explanation:

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Answer 2

Answer:

d water has no effect on blue as well as red litmus. so,it is neutral.