5. What two systems are primarily involved in processing food? *
digestive and respiratory systems
muscular and circulatory systems
digestive and muscular systems
digestive and excretory systems

Are the layers of rock above and below the coal older or younger?

When does an organism become an adult during a life cycle? a)before metamorphosis is complete b)after producing offspring c)after development is complete d)before gametes fuse

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