I Need help I am mostly stuck on A) if you guys can do A then I can do the rest myself

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What happens when the cell copies its chromosomes

What are the three different shapes, or structures, of carbon-based molecules

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