Question

how does the upside - down jellyfish feed?
it stings fish and eats them
it absorbs nutrients through its skin
it filters water
it uses algae living in its tissues

Explanation:

Upside - down jellyfish (Cassiopea species) have a symbiotic relationship with zooxanthellae (a type of algae). The algae live in the jellyfish's tissues. Through photosynthesis, the algae produce nutrients that the jellyfish can use. While jellyfish do have stinging cells (nematocysts), upside - down jellyfish do not primarily rely on stinging and eating fish as their main feeding mechanism. Absorbing nutrients through the skin is not the main way they feed, and filtering water is not their typical feeding behavior for obtaining most of their nutrients.

Answer:

It uses algae living in its tissues