The correct answer would be: The up-and-down motion of the tongue when sucking.
I hope that helped! c:
Predators have to eat. If things are good in an eco-system then the prey is eating good which means the predators can eat good also. Starvation means that things in the eco-system are going bad. Also, It helps the earth maintain its balance. If too much of any aspect of the system is removed it throws the whole thing off balance. too many herbivores will eat too much vegetation.
Jawless fish. The class Agnatha is a class made up of jawless fish. It excludes all vertebrates with jaws.
Answer:
C. amount of peer review.
Explanation:
