Explain why the water plant contains the pesticide ddt

The water plants contain DDT or dichlor-diphenyl-tricloroehane was developed in the 1940s as an insecticide. Because of its availability, it is inexpensive, has a high rate of longevity and can readily be produced that is why it is mostly used as the main ingredient. However, the manufacturing of this product has stopped due to the effects that it has on humans and other organisms. It can accumulate in plants and can destroy fatty tissues in organisms.

Explanation:The water plants contain DDT  was developed  as an insecticide. Because of its availability, it is inexpensive, has a high rate of longevity and can readily be produced that is why it is mostly used as the main ingredient. However, the manufacturing of this product has stopped due to the effects that it has on humans and other organisms. It can accumulate in plants and can destroy fatty tissues in organisms.

sheep is a herbivore animal whereas grasshopper belongs to the class chordates but both of them feed on greens.  

if grasshopper and sheep feeding on a pasture land, i do not think both of them will have any impact on each other. however, the number of the species can make difference. since sheep feed on greens, there is a possibility there left no pasture land for the grasshoppers or they may get extinct.

b tumor cells have a cell wall instead of a membrane

explanation:

tumor cells different from normal cells because tumor cells have a cell wall instead of a membrane.