Water bathes almost all their cells in body of organisms belonging to these animal phyla?

The function of a tiny cell in a large body of an organism is

Flow of water and blood to the respiratory organs is countercurrent in these animals

Organisms of the oceans have a lesser salt content in their bodies than the sea water which has around 3.5% . The fluid could drain out of the body of the organism into the sea. This could be dangerous and fatal to the organism. How do they survive under such conditions?

All organisms begin their life from a single cell called

Which organ of the cell in animals helps in osmoregulation ?

Observe the following statements. a) All living cells of an organism perform respiration, b) Respiration is a catabolic process.

What are the consequences if meiosis not happen in the body cells of the organism. ?

Which of the following is correct: (a) Cells of all living organisms have a nucleus. (b) Both animal and plant cells have a well defined cell wall. (c) In prokaryotes, there are no membrane bound organelles. (d) Cells are formed de novo from abiotic materials.