C. recycling
the rest are destroying the earth
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.
1. Sensory Receptors: Detects changes of internal or external stimulus.2. Integrating center: sends signals to proper areas of the body regarding the stimulus.3. Effectors: Respond to stimulus to maintain homeostasis.
The color depends on the surface temperature of the star