The heart gets its own blood supply through the circulation

PLS HELP ME

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.

d. planting trees

the trees take in carbon to make oxygen.

i got you i did it ya know what it is just needing to fill this in for a quick task!