Hydra removes undigested food by
...Hydra removes undigested food by
passing it through the anus
passing it through the mouth
means of a contractile vacuole
egesting it through the body surface
Correct answer is B
No explanation has been provided for this answer.
The following animals are invertebrates except ...
The highest level of ecological organization is the ...
Which of the following scientists did not contribute to the development of genetics? ...
Soil permeability refers to ...
Amphibians are normally found ...