Ejaculation of semen:

  • A
    Involves rhythmic contractions of striated muscles
  • B
    Is aided by sympathetic nerve activity
  • C
    Coincides with the feeling of orgasm
  • D
    All the above

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Composition of semen is

In the egg of a bird,the shell and shell membranes are:

Differentiate between the following:
$1.$ External reproductive characteristics of male and female.
$2.$ Internal reproductive characteristics of male and female.

What is the type of egg found in birds?

Where does the structural transformation of sperm occur?

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