Hard calcium carbonate structures are used as a skeleton by

The animals having a blood-filled coelomic cavity belong to which phylum?

Who proposed the two kingdom classification?

State appropriate terms for the following:
$(i)$ Amphibians of the plant kingdom.
$(ii)$ Plants not having well-differentiated body design.
$(iii)$ Single-celled,eukaryotic,and photosynthetic organism.

Draw the structure of Paramecium and label any six parts on it. List any two similarities and two differences between Amoeba and Paramecium.

Give the points of differences between non-chordates and chordates.