Question

use the evidence in the text to select the photosynthetic organism.
nembrotha cristata is a sea slug with bright green spots. this sea slug eats jellyfish and takes their stinging cells into its own body. if threatened, the sea slug then shoots out the stinging cells.
the opuntia microdasys cactus gets its green color from chlorophyll. the cactus uses the chlorophyll to capture energy from sunlight. the cactus has yellow spots made of hair - like spines that help protect it.

Explanation:

Photosynthetic organisms use chlorophyll to capture energy from sunlight. The cactus (Opuntia microdasys) has chlorophyll as stated in the text, while the sea slug (Nembrotha cristata) gets stinging cells from jellyfish and has no mention of using chlorophyll for photosynthesis.

Answer:

Opuntia microdasys cactus.