After reading the paragraph below, answer the questions that follow. consider the following marine community. sea otters prey on sea urchins and therefore maintain a healthy sea urchin population. sea urchins prey on kelp. by to maintain viable sea urchin populations, the sea otters are also allowing enough kelp to grow and act as a habitat for other organisms. 12.in this marine community, the sea otter is a. a primary consumer b. a producer c. a keystone species d. a scavenger

The correct answer will be option-C

Explanation:

Keystone species are the key species of any ecosystem which greatly influence the other species of the existing species of that habitat.

The keystone species are called so as without them other inhabiting species would be dramatically different or it could change the ecosystem.

The sea otters are considered the keystone species as they help maintain the population of the sea urchins as well as the kelp preyed by the sea urchins and also provide a home to other species.

Thus, Option-C is the correct answer.

sulfur dioxide

explanation: acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. these substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.