Which of the following components are part of an ecosystem?

Which of the following components are part of
  an ecosystem?
 
  a. plants
  b. animals
  c. rocks and soils
  d. plants and animals
  e. plants, animals, rocks, and soil

Question 2

Which of the following definitions is
  CORRECT?
 
  a. A community refers to interaction between
  populations and their environment.
  b. A community refers to interaction between
  species and their environment.
  c. A community refers to the area in which
  different species live.
  d. A community refers to all species that live
  and interact in a specific area.
  e. None of these are correct