Answer:
sedimentary rock
Explanation:
The fossils are found in sedimentary rocks such as sandstone, limestone and even coal. This type of rock tends to be in very deep layers and for this reason they are easier to house the fossils. they are formed by the melting of other rocks.
The cardiac cycle is defined as the steps involving the conversion of deoxygenated blood to oxygenated blood in the lungs and pumping it by the heart to the body through the aorta. So i think it would be stable over the years unless u have factors that will affect the cycle depending on a persons health
I believe it’s D. It can be a cycle
I believe it would be either A or D sorry for not specifying;(
