Question

which of the following are examples of human interactions that positively affected the ecosystem?
people cut down trees to clear the land for grazing cattle and business development that would increase economic welfare.
pollution damages salmon habitats around the hoh river.
boaters introduce quagga mussels to the great lakes.
people do not live in serengeti national park but can live in game controlled reserve areas (loliondo) and ngorongoro conservation area.

Explanation:

• Cutting down trees for grazing and business development (first option) harms the ecosystem by reducing forest cover, which is bad for biodiversity and climate regulation.
• Pollution damaging salmon habitats (second option) negatively impacts the aquatic ecosystem and the species that depend on it.
• Boaters introducing quagga mussels (third option) is an example of invasive species introduction. Invasive species can disrupt the balance of an ecosystem by out - competing native species for resources.
• People not living in Serengeti National Park but being allowed in Game Controlled Reserve Areas and Ngorongoro Conservation Area (fourth option) is a form of conservation zoning. This helps in protecting the core ecosystem (Serengeti National Park) while still allowing some human - related activities (in the other areas) in a more sustainable way.

Answer:

People do not live in Serengeti National Park but can live in Game Controlled Reserve Areas (Loliondo) and Ngorongoro Conservation Area.