• Many individual organisms can be organized into the following levels: cells, tissues, organs, and organs systems.
  • An ecosystem consists of all the populations in a given area, together with the nonliving environment.
  • The biosphere is the part of Earth where all life exists, including all the land, water, and air where living things can be found.
  • A measure of Earth’s biodiversity is the number of different species of organisms that live on Earth.
  • At least 10 million different species live on the Earth today.
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