Complete the missing links:
Connecting link between reptiles and mammlas is ________

Connecting link between anneldia and Mollusca is

Peripatus is a connecting link between?

Complete the missing links: …………….. Acts as a connecting link between Annelida and Arthropoda.

Complete the missing links: Cocoon is secreted by ……………….

Complete the missing links: The excretion in insects is by …………………. .

Complete the missing links: Ecology is the study of………………

Complete the missing links Insect pollinated flowers are called ……………..

Complete the missing links Cacti are grown by……. Cutting.

Complete the missing links: Progesterone is secreted by ________

Complete the missing links: Secondary treatment for polluted water are _________ and activated sludge method.