Match each phylum or class to its correct characteristic.
mammals
rotifera
cnidaria
mollusca
nematocyst
arrowright
radula
arrowright
mammary glands
arrowright
cilia in circular arrangement
arrowright

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

9. the history of life on earth is recorded in

The current thought on the structure of the cell membrane is: a. a static phosphate sandwich of lipids b. a fluid-mosaic of phospholipids and proteins c. a bilayer of proteins with static lipid molecules d. an impermeable bilayer of protein molecules e. a static and permeable phospholipid single layer