Which tool could you see a plant cell? a. a filter b. a microscope c. a microwave d. an electromagnet

Tides that occur during the new and full moons

24. how are vaccines used to keep people healthy?

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