The wing of a bat and that of a bird, the flippers of a whale and the fins of s fish are example of

The cell is a functional unit of living organisms because

The organelle which eliminate water from the body of protozoa is

The following are functions of the skeleton except

The mechanism of gaseous exchange in living organisms is essentially by

Which of the following statement is correct about diffusion?

The process of anearobic respiration of yeast in sugar solution is known as

Muscles are attached to bones by means of

Spirogyra is regarded as a multicellular plant because