Question

what essential element of photosynthesis do humans provide? they ensure that plants have adequate water they breathe out the carbon dioxide needed by the plants they ensure that plants get enough sunlight they do not play any role the victim was not chemically poisoned. the victim was not attacked by a cougar mr. chem was diving in the pool. professor astro was watching the avengers in the movie theater.

Explanation:

Photosynthesis in plants uses carbon dioxide, water, and sunlight to produce glucose and oxygen. Humans breathe out carbon - dioxide which is an essential raw material for photosynthesis.

Answer:

They breathe out the carbon dioxide needed by the plants