Immortal individuals are

Which is the mode of reproduction in $Amoeba$?

Explain the senescence phase.

Which of the following statements support the view that elaborate sexual reproductive processes appeared much later in organic evolution?
$I.$ Lower groups of organisms have complex body design
$II.$ Asexual reproduction is common in lower groups
$III.$ Asexual reproduction is common in higher groups of organisms
$IV.$ High incidences of sexual reproduction are visible in angiosperms and vertebrates

In which of the following organisms does embryo formation $NOT$ occur as a result of sexual reproduction?

The given figure shows gametes. Select the correct option.