What is the primary purpose of a game reserve?
a. to protect animals from hunting
b. to protect farmland from desertification
c. to protect forests from deforestation
d. to protect rivers from damming

Option A, to protect animals from hunting, is the right answer.

A game reserve is a sphere where the mammals live securely or are hunted in a controlled method for entertainment. It is regarded as the game reserve because hunting takes place in these spheres if hunting is banned in such spheres they will convert into nature reserves; as the patron provides facilities to the animals of the reserved sphere. Moreover, animals in such reserves live with protection or free from the fear of common people.

littering streams           is the answer

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.