Question
The table shows the processes of external fertilisation and internal fertilisation.
External fertilisation Internal fertilisation
The female releases the eggs (ova) outside its body. The male releases the sperms on the eggs. Fertilisation takes place outside the female body. The male releases the sperms inside the body of the female. Fertilisation takes place inside the female body.
$6.$ Which of these is true about external fertilization and internal fertilization$?$
  External fertilization Internal fertilization
$A.$ Both parents are necessary Both parents are necessary
$B.$ Embryo is not formed Embryo is formed
$C.$ Involves development of eggshell Involves development of eggshell
$D.$ Takes place among invertebrates Takes place among vertebrates

Answer

$6. A.$ Both parents are necessary /both parents are necessary

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