loam: a rich soil consisting of a mixture of sand and clay and decaying organic materials
matter: that which has mass and occupies space
base pair: one of the pairs of chemical bases joined by hydrogen bonds that connect the complementary strands of a DNA molecule or of an RNA molecule that has two strands; the base pairs are adenine with thymine and guanine with cytosine in DNA and adenine with uracil and guanine with cytosine in RNA