b. exhaustion level.
c. sweat rate.
d. heart rate.
Heart rate is the most accurate of the metrics available for measuring the effectiveness of exercise. Therefore, the correct option is D.
Heart rate is a useful indicator of the circulatory response to physical activity and can give an indication of the degree of physical exertion. Heart rate increases during activity to meet the body's oxygen and energy needs. Cardiovascular workload increases with exercise-induced heart rate.
To achieve specific fitness goals, people can set their exercise intensity and monitor their heart rate to ensure they are working within their target heart rate zone. Improvement in heart rate, or the speed at which heart rate returns to normal after exercise, can potentially reveal information about cardiovascular fitness.
Therefore, the correct option is D.
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B. respiratory system
C. circulatory system
D. excretory system
b. it was washed by rain into streams, rivers, lakes, and ponds.
c. it was ingested by fish and other aquatic animals.
d. all of the above. please select the best answer from the choices provided a b c d
DNA replication would happen at a slower rate.
Fewer mutations would occur during DNA replication.
Identical copies of the original DNA would not be formed.
Answer:
The correct answer is "Identical copies of the original DNA would not be formed".
Explanation:
Hydrogen bonding between nitrogenous bases in DNA is one of the characteristics that makes unique the sequences of DNA. This is known as complementary base pairing, at which in regular conditions cytosine could only bind with guanine by forming three hydrogen bonds, and adenine with thymine by forming two hydrogen bonds. If hydrogen bonds could be formed between any two nitrogenous bases in DNA, the formation of identical copies of the original DNA would not be possible. DNA polymerase identifies the next nucleotide during polymerization by complementary base pairing, if this mechanism did not exist DNA polymerase would not be able to make identical copies of DNA.