Question

How algae do photosynthesis in bottom of sea where light cannot penetrate

Answer 1

Answer:

not all types of alga can do this. there's a class called rhodophyceae(red algae) which can photosynthesize where little or no light enters beneath the sea.

Explanation:

they have a pigment called r-Phycoerythrin which can absorb Blue,violet light of visible spectra and UV radiation to perform photosynthesis.