A. Living together of the two species, one of which is benefited by the association where as the other is neither beneficial nor harmful  

B.  Living together of two or more species of organism for mutual benefit

C. The joint action of the two organisms on a carbohydrate, resulting in the production of gas that is not formed by either organism cultivated separately   

D. Living two organism together which are harmful to each other

A. wind

B. insects

C. water (through the ground)

D. fire

A. The pest population level at which control measures should be taken to prevent the pest population from reaching economic injury level              

B. The lowest pest population density that will cause economic damage

C. The optimum pest population density that will cause economic damage         

D. The pest population level at which application of pest control measures will be uneconomic

A. Species 

B. Division

C. Family 

D. Genus

A. Parasite 

B. Predator 

C. Herbivorous 

D. Saprophytes 

A. aphid

B. gypsy moth

C. spider mite

D. tent caterpillar

A. ease of application

B. economic feasibility

C. safety

D. timing of the application

A. Alimentary canal

B. CNS

C. Reproductive system

D. Dorsal blood vessel

A. Occiput

B. Vertex

C. Frons

D. Gena

A. Apophysis

B. Apodeme

C. Apolysis

D. None of these