The heart is enclosed in a membrane called?

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

Biological organization is?

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

Operculum is present in?

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

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?

Communities are ________ collection of organisms?