Plants take in CO2 from the atmosphere and, using the energy in light, combine it with water to make sugars they use as food. Oxygen is also released through this process. Plants are known as producers because they can produce, or make, their own food. What process do plants undergo that enables them to convert carbon dioxide and water into sugars?

enhanced global partnerships and exploration capabilities may advance international preparedness for protecting the earth from catastrophic events such as some asteroid strikes, advancing collaborative research on space weather and protecting spacecraft by developing new means for space debris removal.

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".