Question

How do simple organisms exchange substances?

Answer 1

By the simple physical forces.

Explanation:

1. The simple organisms such unicellular or the organisms, where the organ systems differentation is absent, exchange the substances by the simple physical forces.
2. The simple physical forces may be diffusion, osmosis etc. It is a passive exchange, where the vital forces are not used.
3. But in special circumstances, active process helps in the exchange of substances by utilising the ATPs molecules. Here, the substances are exchanged against concentration gradients. Thank you