A scientist conducted an experiment to determine how the amount of salt in water affects the number of plants that can live in the water. In this experiment the independent variable is?

(A) The number of plants in water
(B) Water
(C) The temperature of the water
(D) The amount of salt in the water

Which of the following is a form of research typically conducted by teachers, counsellors and other professionals to answer questions they have and to specifically help them solve local problems?

(A) Experimental research
(B) Descriptive research
(C) Basic research
(D) Action research

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