I believe the answer is a. crossing over
Hi whats up, you wrote a statement not a question...
Answer:
a contracting mass of gas which represents an early stage in the formation of a star, before nucleosynthesis has begun.
Explanation:
Coral can be a good food source, which it is fished for people all over. But too much of it can be bad for coral reefs.
Using nets instead of bad fishing devices can lead to fish eating algae which is good for the ecosystem.
Traps that are too close to coral reefs can damage them, leading to death or a long time to recover.
They are similar in that both involve the growth of new organisms in an environment. However they differ in that primary succession occurs in a place where no life had been before, while secondary succession occurs in place where life had been before, but was destroyed
