Why can overfishing lead to ecosystem collapse? Will O A. Many mammals rely on fish for food. B. Eventually, it will lead to exponential growth. O C. Fish help maintain the temperature of the ocean. O D. The predators that rely on fish will increase in population. n e w 8/28/2020

Which of the following must be true for a fossil organism to be useful as an index fossil? a. the fossil organism must be widespread geographically. b. the fossil organism must be abundant. c. the fossil organism must be limited to a short span of geologic time. d. all of the above.