The correct option is C. To identify an organism based on characteristics of known organisms.
Explanation:
Dichotomous keys can be described as a tool which assists its users to identify living things easily like a tree or a mammal. The keys contain a series of options which enable a learner to know about the correct name of an organism. It also compares it with the name of other organisms. A layman can even learn the scientific names of organisms with the help of the dichotomous keys.
CO2 molecules can vibrate in ways that simpler nitrogen and oxygen molecules cannot, which allows CO2 molecules to capture the IR photons. Greenhouse gases and the greenhouse effect play an important role in Earth's climate.
