List the two types of atroventricular valves. beside each describe where they are located

Classify the structures as homologous or analogous, depending on their structure and function.

The breakdown of food is accomplished by enzymes. a. physical b. chemical c. mechanical d. none of the above

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