When both ovaries of the human female ovulate simultaneously and both ova are fertilized, then

A serious disadvantage of complexity in higher organisms is

Which of the following adaptation is no found in fruits and seeds dispersed by the win '?

The group mollusca is characterized by the presence of

A virus can sometimes be regarded as a living organism because it

Which of the following groups embraces the rest?

The main similarity between unicellular and multicellular organisms is that both

One important characteristic of green plants is that they

A mayor difference between plants and animals is that