What causes cold , deep currents to from in the oceans near the poles

How do adaptation affect a species?

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

Which macromolecule catalyzes chemical reactions this be considered enzyme chemical reactions thus he considering enzymes