occurs in |
|||||||
a) |
Freshwater |
b) |
Ponds and lake |
c) |
River |
d) |
Ocean |
occurs in |
|||||||
a) |
Freshwater |
b) |
Ponds and lake |
c) |
River |
d) |
Ocean |
(b)
occurs in stagnant water (ponds and ditches), though some species are marine.