Amphibians do not have the following:

Name two egg-laying mammals.

Which of the following is not a characteristic feature of Protochordata?

What do you understand by the term $diploblastic$? Give one example of an organism that is $diploblastic$.

Classify the following organisms based on the absence $/$ presence of true coelom,i.e.,acoelomate,pseudocoelomate,and coelomate:
$(a)$ Scorpion
$(b)$ Sea anemone
$(c)$ Ascaris
$(d)$ Earthworm
$(e)$ Wuchereria
$(f)$ Nereis

Organisms having 'pores' all over the body and a canal system for bringing in food and oxygen belong to the phylum: