28. During rest, an adult’s heart rate averages 60-100 beats per minute. When exercising, an adult’s heart rate may increase to 100-170 beats per minute. State one reason why the heart rate increased during exercise.

How have the greenhouse gasses increased from the year 2000 to 2018

Draw two cyclic constitutional isomers of cis-1

In what way do investigations build scientific knowledge? the results of investigations lead to questions that cannot be tested. they reflect the opinions and social values of scientists, ensuring valid information. the results of investigations lead to new questions, which lead to new investigations. they are not influenced by the research of earlier scientists, so they are able to address gaps in understanding.i