4. Coevolution is when two species that have close ecological interactions evolve jointly over time.

No. In biology, coevolution occurs when changes in at least two species' genetic compositions reciprocally affect each other's evolution.

No, coevolution never occurs when two species that have close ecological interactions evolve jointly over time.

Explanation:

The coevolution is the process in which two species evolves together. These species affects each other. In coevolution, species shares close ecological interactions.

The ecological relationship which shows coevolution are parasitism and competition, mutualism. In parasitism one species is negatively affected and the parasite gains the benefit. In competition both species harm each other.

In mutualism both species gains the benefit.