A hypothesis must be testable to be scientifically valid. Being testable means that: a) Some observation could prove the hypothesis incorrect.
b)Only a controlled experiment can indicate whether the hypothesis is correct or incorrect.
c) The hypothesis is proven wrong.
d) The opposite of hypothesis is tested and proven wrong.​

i think that d. wind is the answer.   i missed the question when i answered a. currents.

answer: national resource conservation services

national resource conservation services is the us. based approach that provides technical and financial assistance for natural resource management. nrcs society in conservation of resources by involving in activities like farmland protection, flood prevention, watershed protection, urban conservation, conserves economic and environmental conditions. it conducts soil surveys and implements the policy of natural resources management on the society.

yes, because even though a theory has a  lot of evidence to support it, it is not always true