Question

which of the following events is most likely to trigger a mass spawning event on a coral reef?
a strong hurricane
a particular moon phase
a mass die - off of corals after a warm year
a large predaotr nearby
too much algae growing on the reef
what is the function of nematocysts?
to inject venom
to filter food particles
to allow movement
to aid in digestion

Explanation:

Coral reefs often synchronize their mass spawning events with lunar cycles (a particular moon phase). Nematocysts are specialized cells in cnidarians (like jellyfish, corals) that inject venom to capture prey or for defense.

Answer:

A particular moon phase.
to inject venom.