The <u><em>correct answer</em></u> is:
He needs to select a more representative sample.
Explanation:
Choosing students from the basketball team for the sample he uses on a study of heart rates and exercise will be a biased sample. This is because students on the basketball team are potentially healthier than other students, which means that exercise will not have a large an effect on their heart rate as it would if they were not as healthy and not as physically fit.
In order to reduce the amount of bias, he should choose students from different groups throughout the school.
Answer:
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The development that belongs at the end of Cherie's timeline is <span> genetic engineering. This is because all the topics in her timeline involve the study, discovery, and development of the human DNA. The last part should include the scientific breakthrough called genetic engineering which allows us today to modify the genetic makeup of organisms to produce desired results.</span>
Answer:
A. Red blood cells and muscle cells.
Explanation:
Cellular respiration which takes place in the presence of the oxygen is known as aerobic respiration and which takes place in the absence of oxygen is known as anaerobic respiration.
In anaerobic respiration, the cells produce a very low amount of ATP compared to the aerobic respiration but still in the human body to survive, the cells have this conserved process.
The cells in humans in which the process takes place are the red blood cells which do not possess the nucleus, the mitochondria and the other organelles so they perform anaerobic respiration. The muscle cells, when deprived of oxygen, undergo anaerobic respiration which produces a very low amount of ATP molecules and lactic acid also called fermentation.
Thus, option-A is correct.
