The brain and spinal cord work together so the body can receive signals and react to the environment. What is the spinal cord?

Which best describes meiosis? a. it produces cells that are identical to the original cell b. it is responsible for the replacement of damaged skin cells c. it is responsible for growth of the organism d. it produces male and female sex cells

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above

Which organisms udergo photosynthesis