Match the animals to the phenomenon that they undergo.
regeneration
metamorphosis
produce milk through
mammary glands

The first and the fourth figure shows metamorphosis, the second figure shows regeneration and the third figure shows the feeding of babies with mother's milk.

Explanation:

The first and the fourth diagrams show the adult stage and the larval stage of Beetle. Beetle is an Arthropoda which has the unique characteristics of Metamorphism. The eggs laid by the adults hatch into a larva which then undergoes one or many moultings to get into adult or the reproductive stage.

The second figure is that of a Cnidaria. The members of phylum Cnidaria like hydra etc has the capability to regenerate the full body part from a damaged part, thereby reproducing asexually. This is shown in the diagram.

The third diagram shows a cow which is a mammal. Mammals do have unique characteristics of feeding their child with mother's milk. They also do have mammary glands which produce milk after a child birth.