Coral and algae have a reciprocal relationship in which the algae perform photosynthesis, providing the coral with nutrition and with the calcification process. in return, the coral provide the algae with nutrients. this is an example of a relationship.

This is an example of a symbiotic relationship.

Explanation:

A symbiotic relationship is a close, prolonged association between two or more organisms of different species that normally benefits both members. A good example of symbiotic relationship is a coral and algae, bacteria in the human gut etc

From the information provided, the algae perform photosynthesis, providing the coral with nutrients for feeding and help with calcification. In return, the coral provide the algae with nutrients for it's growth.

it's unlikely a majority of a large population would agree on issues

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"a.) well–developed vascular system."