Why is it necessary to have regularly spaced gaps between sections of concrete sidewalk?

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 best example best demonstrates the importance of having knowledge of evolutionary relationships? a. illustration of a plant b. organ transplantation between species c. blood donation from a human d. do you need sequence of an insect.

Consider the equation s + o2 ? so2. what is the product? question 3 options: s so 2 s + so 2 o 2