Which statement is a fact? coralline algae, sponges, and other organisms contribute to reef growth. coral reefs should be protected by environmental laws. coral reefs are the most diverse and beautiful of all marine habitats. we should respect coral reef researchers like thomas goreau, who began working on coral reefs in the 1950s.

Within that list, the statement that is a fact is A. Coralline algae, sponges, and other organisms contribute to reef growth.

Explanation:

A fact is something that has actual existance, or that is confirmed or validated to such an extent that is considered real. Opinions, suggestions or reflections are not considered facts, because they are subjective.  Therefore, it is important to check the verifiability of a statement before considering it a fact. Within this list, sentence A is the only one that can be objectively demostrated and considered a fact.