What is a siphon? what's its function?

Iwill give brainiest to first person who gets it ! what are 3 basic types of interactions we see in an ecosystem?

Write a paragraph at least 5 sentences “why all vaccinations should be mandatory”

An example of internal feedback working to maintain homeostasis is your a. decreased respiration rate when you are studying b. decreased heart rate when you are sad c. increased respiration rate when your muscles need more oxygen d. increased heart rate when your lungs need more oxygen