An ecosystem that absorbs carbon, like a forest, is a carbon ; an ecosystem that releases carbon, like farmland, is a carbon .

im not intirely sure but i think the anwser is d relative humidity

the rocks are classified by the geological process they are formed by. the three main groups of rocks are igneous, metamorphic, and sedimentary. minerals are not they are classified under the chemical classes they are in. these groups include silicates, sulfates and carbonates.

a) carbon, hydrogen

b) carbon, hydrogen, oxygen, nitrogen

c) carbon, hydrogen, oxygen, nitrogen, phosphorus

d) sugar

e) amino acid

f) nucleotide