A hatching egg of chick is covered by plaster of paris. It is harmful for
Mother
Respiration
Excretion
None of these
(b)Egg shell is porous; if it is covered, the passage of air will be blocked.
Relaxin (a hormone) is secreted by
Saheli is a oral contraceptive containing
Which of the following provides nutrition to sperm?
Mammary glands are modified
The minimum number of barriers present between foetal and maternal blood is present in which type of placenta?
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