The best example of a keystone species from the available answer choices is:
- A keystone species is an important pointer in any ecosystem that helps make sure that the ecosystem doesn't go extinct.
- They have low functional redundancy which means that if there is a decline in the diversity of the ecosystem, then the traits are lost.
- A sea otter is a good example of a keystone species because they are high on the food chain in the marine ecosystem as they are the predators and help reduce the number of sea urchins who eat the kelp.
- This action of the sea otter ensures their survival in the ecosystem.
- Therefore, the correct answer is option A
Read more here:
https://brainly.com/question/2044051
