Fossils are used to determine the ages of rock layers. Index fossils are the most useful for this.
Answer: Valves in the veins
Explanation: The flow of the blood inside the body takes place through the veins and arteries. The oxygenated blood from the heart is supplied to the different parts of the body.
The blood flows from the capillaries to the venules and from there to the veins. The blood moves in the veins by the rhythmic movement of the smooth muscles in the body.
Most of the blood moves against the gravity so there is a chance that it can backflow so to prevent this there are valves in the veins known as one way valves.
We would know the climate it came from, how it might of died, how it became extinct, we can tell how long the organism might of lived after long and hard studies. We could tell its age, and what organsim the fossiles were from. Hope this helped! ~)*^*)~
D. Biology. In forensics, they use DNA-related evidence, and DNA relates to biology.
