Could someone me with these two simple science questions real quick? i chose answer b) for the first one and c) for the second but i'm not 100% attached)

The first one is correct , it is B. because during the process of Ecological Succession , an increasing number of resources and niches become available for other animals . The second one is correct also , it is C .

Im in college bio right now and i believe that these are right. 

Idont really understand

Essential for a scientist to do for credibility

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.