Answer:
B, A fossil found in rocks from one time period
Explanation:
Fossils are used to determine the ages of rock layers. Index fossils are the most useful for this. Index fossils are of organisms that lived over a wide area. They lived for a fairly short period of time. An index fossil allows a scientist to determine the age of the rock it is in. Hope that this helps you :)
I believe the answer is metabolism...
Yes that's right, its True, are structures that have specific functions
Regular water temperature has a high surface tension. Without surface tension, small particles like dust could sink into the water and kill marine life that live below. This could cause whole ecosystems to be destroyed. I hope this helps!