Food chains are very important for the survival of most species. When only one element is removed from the food chain it can result in extinction of a species in some cases. The foundation of the food chain consists of primary producers
Primary producers, or autotrophs, can use either solar energy or chemical energy to create complex organic compounds, whereas species at higher trophic levels cannot and so must consume producers or other life that itself consumes producers. Because the sun's light is necessary for photosynthesis, most life could not exist if the sun disappeared. Even so, it has recently been discovered that there are some forms of life, chemotrophs, that appear to gain all their metabolic energy from chemosythesis driven by hydrothermal vents, thus showing that some life may not require solar energy to thrive.

Matter and energy are two fundamental inputs of an ecosystem. Movement of

Options

A. Energy is bidirectional and matter is repeatedly circulating.
B. Energy is repeatedly circulation and matter is unidirectional
C. Energy is unidirectional and matter is repeatedly circulating
D. Energy is multidirectional and matter is bidirectional

Answer

C

Explanation

Energy is unidirectional and matter is repeatedly circulating