What role do autotrophs (producers) play in ecosystems?

Consider the last statement in the prompt: "people take such environmental factors into account in their choices when deciding where to live." do all people have a choice as to where they live? what factor plays a key role in this decision and may therefore play a large role in determining quality of life?

The term used to describe a disease-causing microorganism isa. virus.b. infection.c. pathogen.d. microbe.e. bacterium.

2. given that most biochemical (other than coal) rocks react with hydrochloric acid, what does that tell you about organisms?