What are the molecules labeled A & B in Figure 1?

Each trait of a plant is determined a. an allele b. one gene c. a pair of genes d. one dominant gene

Chlorophyll is found in plant leaves and absorbs light from the sun to enable plants to perform photosynthesis. magnesium is an important component of chlorophyll. the concentration of magnesium ions is higher in the root-hair cells of plants than in the soil. which mechanism of ion uptake would best enable a plant to produce a steady supply of chlorophyll? osmosis diffusion passive transport active transport

In what for do plants utilize nitrogen? why do they need nitrogen?