Ctenidia are repiratory organ in ………….

Complete the given analogy. Fish respiratory organ:Gills Bird's Breathing organ:____

Vestigial organs

Micro organisms are measured in ……………. .

Which are the different organs in body of organisms?

List the excretory organs present in our body. Give the products excreted by these organs.

In the animal world, some organisms have both male and female repro-ductive organs. a. What do you call such organisms? b. Give two examples.

The sensory organs contain ………. neuron.

Largest sense organ

Sudden appearance of vestigial organs in highly enlarged organisms ____