Diploid zygote is universal in

........ and ........ are examples showing external fertilization.

The lifespan of an organism is defined as:

Examine the figures $A, B, C,$ and $D$ given below and select the right option for female sex organs.

In some organisms like $A, B, C$ and $D$, the female gamete undergoes development to form new organisms without fertilisation. Identify the correct set of organisms.

Reproduction is a biological process in which an organism gives rise to young ones (offspring) similar to itself. An organism's method of reproduction depends upon which of the following factors?