Name two animals which undergo external fertilisation and two animals which undergo internal fertilisation?
Fish and frog undergo external fertilisation. Human and lion undergo internal fertilisation.
X and Y are the two types of animals. The animals like X undergo external fertilisation whereas animals like Y undergo internal fertilisation. The animals like X lay eggs from which baby animals are hatched. On the other hand, in animals like Y, the young one develops inside the uterus of mother which then gives birth to the baby.
(a) What is the general name of animals like X ?
(b) Give two examples of animals like X.
(c) What is the general name of animals like Y ?
(d) Write the names of two animals like Y.