7. Choose the best answer.

Increased input to this cycle may be responsible for global warming.
carbon
potassium
nitrogen
phosphorus

What protects the lining of the stomach from acidic gastric juices?

Why do bacteria thrive even in hostile environments

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