Ascientist is studying the natural feeding habits of tigers.

in order to obtain the best data, which approach should the scientist use?

a. perform tests in the laboratory
b. observe tigers in the zoo
c. observe tigers in the wild
d. set up controlled experiments

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It decreases by 4 is your answer mark brainliest 

According to arrhenius theory of acid and bases, an acid is a proton donor, while base donates hydroxyl ions. further, acid and base reacts to form salt and water.consider following example.hcl    +      h2o          →      cl-          +      h3o+here, hcl has donated a proton, hence it is an acid.now consider following reactionhcl      +      naoh            ↔      nacl      +        h2oin this reaction, hcl donates proton, hence it is acid. on other hand, naoh donates hydroxyl ion (i.e. hence it is a base.