Researchers found that the stomata density on the leaves of a species of plant change as the concentration of Co, in the atmosphere changes. When grown at 350 ppm CO2 the pla has an average density of 300 stomata per mmº, but when grown at 400 ppm CO, the plant has an average density of 250 stomata per mm?.

Why are small quantities of chlorofluorocarbons so harmful to the ozone layer? a. the chlorofluorocarbons act like ultraviolet radiation causing large amount of ozone to be produced. b. the chlorine from the chlorofluorocarbons reacts with free molecules of oxygen causing a stop in ozone production c. free oxygen atoms can replace the chlorine in chlorine monoxide, releasing a free atom of chlorine which can then recombine with an oxygen atom in ozone, destroying more ozone. d. chlorofluorocarbons absorb ultraviolet radiation, preventing the formation of ozone select the best answer from the choices provided

Where do homologous chromosomes exchange genetic material through crossing over?               a.  chlorophyll    b.  centrosomes    c.  centromeres    d.  chiasma

Dna is always read in the whereas rna is read in .