We need blood because it carries oxygen and helps us sustain life. The organ that pushes blood through the body is the heart.
Answer:External respiration occurs in the lungs where oxygen diffuses into the blood and carbon dioxide diffuses into the alveolar air. Internal respiration occurs in the metabolizing tissues, where oxygen diffuses out of the blood and carbon dioxide diffuses out of the cells.
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Answer: there is no gravity and no type of life on the moon therefore basically making it a huge target.
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Did alleles for drug resistance occur in bacterial populations that afflict humans, prior to the widespread use of antibiotics in medicine and agriculture? a. No—mutations for drug resistance occur in response to antibiotic use. ... Yes—alleles for resistance arise due to random mutation, so are always present.
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<h2>I think, dead zoning is answer. </h2>
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<h2>Hope it helps you.</h2>
