Most abundant gas; obtained by plants from bacteria in the soil, and obtained by people from foods they eat

Why do leaves change color in the fall? green pigments break down and no longer mask the color of chlorophyll. chlorophyll breaks down and no longer masks the colors of other pigments. red- and yellow-colored pigments grow and mask green-colored chlorophyll. green-colored chlorophyll breaks down and turns red and yellow.

Which nucleotide component contains nitrogen

Natural resources are any materials that humans obtain from the earth to meet our wants and needs.