Living cells use as their main source of energy. a) carbohydrates b) cellulose c) lipids d) proteins

Explain how scientists use geologic time to determine the age of landforms.

Which of these internal feedback reactions does not need your brain? oa. your leg jumping when it is hit by a reflex hammer b. your deeper breathing when you need more oxygen c. your body temperature rising when you have an infection d. your heart beating faster when you are in danger

A. describe the scientific method, using pasteur's swan-necked flask experiment as an example.