The lakes and forests are best classified as examples of

  • artificial ecosystem
  • natural ecosystem
  • natural biosphere
  • artificial biosphere

The minerals are used as nutrients by

  • decomposer
  • producer
  • consumer
  • autotrophs

Where does Rhizobium live?

  • animal stomach
  • human intestine
  • animals brain
  • root nodules

The main component of many biomolecules is

  • carbon
  • sulphur
  • potassium
  • nitrogen
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