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Fill in the blanks: 1. By the end of t...

Fill in the blanks:
1. By the end of the ….a… of pregnancy, the foetus develops limgs and digits.
2. By the end of ….b…, the body is covered with fine hair, eye -lids separate and eyelashes are formed.
3. After …c… of pregnancy, the embryo's heart is formed.

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