Many fishes and other organisms that live in the deep ocean produce light. What are two ways in which this light might be useful?

Explanation:

Bioluminescence is used by living things to hunt prey, defend against predators, find mates, and execute other vital activities. Some species luminesce to confuse attackers. Many species of squid, for instance, flash to startle predators, such as fish.

it cools slower in the earth meaning the crystals have more time to form than lava on the surface

photosynthesis makes the glucose that is used in cellular respiration to make atp. the glucose is then turned back into carbon dioxide, which is used in photosynthesis. while water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water.