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C3 plants

C3 plants produce a three-carbon compound during photosynthesis, including most trees and agricultural crops such as rice, wheat, soybeans, potatoes and vegetables.

C4 plants

C4 plant, mainly of tropical origin, that produce a four-carbon compound during photosynthesis, including many kinds of grass and the agriculturally important crops maize, sugar cane, millet and sorghum

Calorie (cal)

A calorie defined as an energy measure unit. One calorie is the amount of energy required to heat 1 gram of water from 14.5 to 15.5°C. 1 cal = 4.184 Joule

Cambrian explosion

Cambrian explosion is the name of a period approximately 550 million years ago with the relatively rapid evolution of the modern forms of multicellular life.