Which cells form the stomata?
a. sieve cells
b. guard cells
c. phloem cells
d. mesophyll cells

Loss of protected health information collected for research should be directly reported to:

What makes a dominant allele different from a recessive allele

Match the pollutants. 1. a chlorofluorocarbon smoke 2. a biodegradable organophosphate insecticide freon 3. particle pollution paint 4. hazardous waste monoxide 5. carbon is completely burned malathion 6. carbon is incompletely burned dioxide