: DNA testing can identify carriers of the Tay-Sachs allele. In an effort to eliminate this disease, couples at risk are urged to get tested for the allele before they marry or have children. Should doctors or the government have a role in deciding if the couple can have children together?

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