Why is carbon essential to life on Earth? A. Carbon can form compounds of many sizes and shapes.

B. Animals need carbon in order to breathe.

с. Plants use carbon to absorb water into their roots.

D. Carbon is the most abundant element on Earth.

answer///multiple alleles;

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.