Question

why is diffusion and osmosis important to cells?

it allows them to absorb sunlight.

it allows them to reproduce.

it allows them to take in materials without using energy.

it allows cells to use all energy.

Explanation:

Diffusion and osmosis are passive transport processes. Passive transport does not require energy input from the cell. Cells need to take in substances like water (in osmosis) and small molecules (in diffusion) for various functions. Absorbing sunlight is related to processes like photosynthesis (not diffusion/osmosis). Reproduction is a complex cellular process (mitosis/meiosis etc., not directly diffusion/osmosis). Using all energy is not relevant as these are energy - sparing processes.

Answer:

It allows them to take in materials without using energy.