Segmentation in the body is first observed in which of the following:

Write the general characters of Phylum Annelida.

In the animal kingdom,the first time appearance of a true coelom is present in:

Read the following four statements $(A-D)$:
$(A)$ Annelids possess only longitudinal muscles which help in locomotion.
$(B)$ Nephridia do not help in excretion and osmoregulation.
$(C)$ Closed type circulatory system is present in most of annelids.
$(D)$ Members of phylum Annelida are triploblastic,metamerically segmented,and acoelomate.
How many of the above statements are incorrect?

Which animal has the respiratory pigment $Hb$ (hemoglobin) dissolved in its blood plasma?

Which of the following animals are true coelomates with bilateral symmetry?