Match the phrase with the term. how hard the blood pushes on the inside of the blood vessels is called . the total amount of blood the heart pumps in one minute is called . when blood vessels open wider during exercise, they are said to . how many times your heart beats in one minute is called . the force that can put unhealthy tension on the heart as it is pumping is called . the amount of blood the heart pumps out in one beat is called .heart rateblood pressurecardiac outputstroke volumeblood pressuredilate

it takes hundreds of years to become stable.

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hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds

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.