The heart is enclosed in a membrane called?

Communities are ________ collection of organisms?

Biological organization is?

The number of species of organisms currently known to science is?

The arrangement of ________ speaks of the division of labour within cell?

Biometry is the application of_______ in biology?

From right ventricle blood is pushed into?

In which animal respiratory surface are found in more than one organ?

Operculum is present in?

What is the branch of biology in which structure and function of tissues are studied?