Animals like gharial & crocodile live in water as well as on land. Are they amphibians or reptiles?

Identify me.

I am diploblastic & acoelomate. Which phylum do I belong to?

Identify me.

My body is radially symmetrical. Water vascular system is present in my body. I am referred to as fish though I am not. What is my name?

Identify me. I live in your small intestine. Pseudocoelom is present in my thread-like body. In which phylum will you include me?

Identify me.

Though I am multicellular, there are no tissues in my body. What is the name of my phylum?

Write the characters of each of the following animals with the help of the classification chart.

Bath sponge, grasshopper, rohu, penguin, frog, lizard, elephant, jellyfish.

Write in brief about progressive changes in animal classification.

What is the exact difference between grades of organization and symmetry? Explain with examples.