Question

Find the missing links, respectively

Answer 1

The missing link to this problem is C->CO2->CO2

Answer 2

C, CO2 --> CO2

Step-by-step explanation:

Plants --> Oxygen (O2) --> Animals --> Carbon-dioxide (CO2) --> Plants

Plants absorb carbon dioxide which is used in the process of photosynthesis to make food. The plants respire (breathe out/exhale) oxygen, which is taken in by animals such as humans (us), and then use it for respiring or breathing. We breathe out carbon dioxide, which is then used to continue the cycle.

This is the reason why cutting down plants and trees are harmful for the environment; it reduces the number of trees and plants that can reduce the CO2 in our atmosphere.