Ascuba diver went down 20 feet below the surface of the water. then she drove down 3 more feet. later, she rose 7 feet. what integer describes her depth?

Ok. So what you want to do is -20 because it says went down 20 ft. Then -3 more. + 7. -20+-3=-23+-7=16 So you get 16. I hope that helps.

parasites can detrimentally affect their host, but also must not allow their host to die before they can complete their life cycle. some parasites have complex life cycles with many different hosts, and have had to find ways of persisting in many different environments during the change from one host to another. ectoparasites live outside the body of the host, and can more easily  disperse, but are  more exposed to predators, parasites, parasitoids. endoparasites live inside the body of the host, and are therefore protected from the outside environment. but they can be  attacked by the host's immune system. they have therefore developed  mechanisms for dispersal such as  complex life cycles.

when a reversible reaction is occurring in both directions at the same rate; the products and reactants do not change in concentration. a chemical reaction where the compound is broken into its constituent parts.

explanation:

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