1 The purpose of the digestive system is to
OA allow an animal to move by supporting its muscles.
OB. break food down into useful nutrients.
OC. take in oxygen and excrete carbon dioxide.
OD. circulate blood to all the cells of the body.
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plant because they survive by water, sunlight, ex.

explanation:

but there is no

i guess you forgot putting it.

evidence and logical support is essential for a scientist to do in order to maintain credibility. this is because no one can believe without any logic and without any evidence.hence a scientist can maintain credibility by proving himself and by answering logically so experiments prove very beneficial. logical hypothesis give conclusion which is acceptable. therefore, there are two main factors to maintain credibility by a scientist is evidence and logical support.