Which is a role of helpful bacteria.

A-removing nutrients from soil
B-producing oxygen
C-healing sick animals
D-preventing tooth decay

I think it’s b
but I’m not sure

Which best compares habitat and niche? o niche is a place in which organisms live, and habitat is the way in which an organism fits into its habitat.o habitat is a place in which organisms live, and niche is the way in which an organism fits into its habitat.habitat is a group of organisms that live in an area, and niche is a specific species that lives in that areao niche is a group of organisms that live in an area, and habitat is a specific species that lives in that area.

Explain how scientists use geologic time to determine the age of landforms.

Recommend a strategy for incorporating sustainable human activity into a tropical rain forest biome.