Answer:
D.Impressions left by organisms are filled in with sediment that hardens into rock.
Vestigal structures is the answer!!
450 mya, is where you would find fossils.
Explanation:
The first layer would be newer organismis that haven't quite decayed yet.The second and third layer is where the bones of the dead organasims lie, they havent quite been through the whole process yet, but they are nearly complete just about 100,000 years left.The fourth layers have been through alot, and have been there for many many years we can say abot 100,000,000 years.They are ready to become a fossil fuel.
Answer:
Primary active transport.
Explanation:
Active transport may be defined as the movement of particles against the concentration gradient. This is the energy driven process that requires ATP to transport the molecules.
Two main types of active transport are primary active transport and secondary active transport. The calcium has been moved towards its region of higher concentration ( sarcoplamsic reticulum) from its region of lower concentration (cytosol), this transport is against the concentration gradient. The ATP is used by direct hydrolysis. Hence, it is the primary active transport.
Thus, the answer is primary active transport.