Biology

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Across
  1. 2. Regulation of an organism's internal conditions to maintain life is called ________.
  2. 5. She conducted field research for many years to observe chimpanzee behavior.
  3. 6. Studies the diversity of life, research disease, develop technologies, improve agriculture, and preserve the environment.
  4. 9. _____ is the process of natural changes that take place during the life of an organism.
Down
  1. 1. The process of change by which an organism or species becomes better suited to its environment.
  2. 3. Arranged in an orderly way.
  3. 4. The reaction to a stimulus is called _____.
  4. 7. Anything that is part of either environment and causes some sort of reaction by the organism is called ______.
  5. 8. _____ are the basic units of structure and function in all living things.