41.
Which of the following is a fresh water sponge?

42.
The kingdom Protista is primarily made up of organisms that are

43.
Marsupial Kangaroo is

44.
Which one of the following has a bilateral symmetry in its body organization?

45.
Branch of biology which deals with the study of identification, nomenclature and classification of organisms is

48.
In coelenterates mesoderm gives rise to

49.
It is the study of internal organs of organisms.

50.
Their cells have a very well defined nucleus ,in which nuclear material (chromosomes or DNA) is enclosed in double nuclear membrane.

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