Atheory which repeatedly fails to confirm the expected predictions after extensive research: probably needs to be modified probably is incorrect requires more research time should be maintained indefinitely

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Is probably incorrect.

Explanation: -

According to the theory of scientific method, the second step after observation is formulation of hypothesis to explain the observed phenomena.

If the predictions of a long-standing theory are found to be in disagreement with new experimental results, the theory may be discarded as a correct description of the phenomena.

Thus a theory which repeatedly fails to confirm the expected predictions after extensive research Is probably incorrect.

b. probably is incorrect

hope it helps :)

the potential energy of the reactants is 200j.

from the energy diagram, the energy of the product formed is 350j; this means that, this reaction is an endothermic reaction, because it absorbs energy from its environment.

a rain shadow is a dry region of land on the side that is protected against the prevailing winds of a mountain range. the prevailing winds are the winds that occur most of the time in a particular place of the earth

prevailing winds carry air toward the mountain range. as the air rises up over a mountain range, the air cools, water vapor condenses, and clouds form. on this side of the mountains, called the windward side, precipitation falls in the form of  rain  or snow. this dry air produces a  rain shadow.