The biodiversity in a coral reef ecosystem can be changed by both natural and human activities. What is a natural factor that would most likely decrease the ecosystem biodiversity

the immigration of several new populations of sea urchins into the reef.

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.

after making a punnet square using bv bv bv bv you will find that the ratio will be 9: 7 or a 128.6% probability.

hope this