Levels of Organization

Edit Answers
123456789101112
Across
  1. 2. The __________ system includes the lungs and brings oxygen into the body and removes carbon dioxide.
  2. 3. The __________ system protects the body by fighting germs, viruses, and harmful bacteria.
  3. 5. A group of organs working together to perform a major life process.
  4. 8. The __________ system is made of the heart, blood vessels, and blood. It moves oxygen and nutrients to the body.
  5. 9. A group of similar cells working together to do a specific job.
  6. 12. The __________ system includes the skin, hair, and nails and protects the body from injury and germs.
Down
  1. 1. The __________ system includes the kidneys and bladder and removes waste from the blood.
  2. 4. The __________ system is made of skeletal, smooth, and cardiac muscles and helps the body move.
  3. 6. The __________ system includes the brain, spinal cord, and nerves and sends and receives messages.
  4. 7. The __________ system includes the mouth, stomach, and intestines and breaks food into nutrients.
  5. 10. A structure made of two or more tissues working together.
  6. 11. The smallest unit of life.