What are the three subunits of the nucleotides that form a DNA molecule?
A. A nucleic acid, deoxyribose, and a nitrate group
O
B. A nitrogenous base, a sugar, and a phosphate group
C. A nucleic acid, a lipid, and a phosphate group
D. A nitrogenous base, a lipid, and a carbon ring

b brown mice / white sand dunes

measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.