Keystone species contribute to the "balance of nature" and biodiversity because if it is removed from a system, the ecosystem may change drastically and healthy ecosystems need a keystone to function.
Which of the following statements about keystone species is true?
a) They have minimal impact on ecosystem dynamics.
b) They are not essential for maintaining biodiversity.
c) Removal of a keystone species has little effect on the ecosystem.
d) Healthy ecosystems rely on keystone species.