The skeleton is made entirely of cartilage in:

You are given leech,Nereis,Scolopendra,prawn,and scorpion; all have a segmented body organization. Will you classify them in one group? If no,give the important characters based on which you will separate these organisms into different groups.

What is binomial nomenclature? List two advantages of naming organisms.

What is a notochord? What is its function?

State reasons for the following:
$(a)$ Bryophytes are called amphibians of the plant kingdom.
$(b)$ Gymnosperms are called so (naked-seeded plants).
$(c)$ Birds have wings and feathers.

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