Biology, 15.12.2020 05:10 jennifer7037
20. In an investigation to determine the change in
heart rate with increased activity, a biology
teacher asked students to take their pulses im-
mediately before and immediately after exercis-
ing for 2 minutes. The data showed an average
heart rate of 72 beats per minute before exercis-
ing and 90 beats per minute after exercising, if a
valid conclusion is to be made from the results
of this investigation, which assumption must be
made?
1 In most students, the average heart rate is not
affected by exercise,
2 Each student exercised with the same inten-
sity.
3 Exercise causes the heart rate to slow down
Answers: 3
Biology, 21.06.2019 15:50
How does land development destroy ecosystems? it increases human carrying capacity too rapidly. it converts them into residential or agricultural areas. it forces humans to import non-native plants and animals. it expands the natural range of native wildlife species.
Answers: 3
Biology, 22.06.2019 20:00
Are humans interfering with or a part of evolution happening today? find examples of evolution seen in recent history that could be caused by human activity.
Answers: 2
Biology, 22.06.2019 22:00
Which of the following statements best describes homeostasis
Answers: 1
20. In an investigation to determine the change in
heart rate with increased activity, a biology
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