|
Trichocyst and nematocysts are meant for |
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|
a) |
Defence |
b) |
Nutrition |
c) |
Respiration |
d) |
Excretion |
|
Trichocyst and nematocysts are meant for |
|||||||
|
a) |
Defence |
b) |
Nutrition |
c) |
Respiration |
d) |
Excretion |
(a)
For a long time cnidarians and ctenophores were grouped together in the phylum-Coelenterata because these are similar in general appearance, but now, Ctenophora became a new phylum.