Answer:
Yes.
Explanation:
If earning higher grades was important, you would be motivated to study more so that you can reach your goal.
I'd pick A and D, but if you have to pick one, go for A
Answer:
Exercise of any kind.
Explanation:
Doing normal daily activities like lifting groceries or walking up and down stairs can build muscle endurance, other endurance activities include swimming, running, cycling and other similar activities that involve a repeated motion over a longer period of time, However you don't necessarily have to exercise to do so.
Answer:
longitudinal
Explanation:
Longitudinal study is a research method that aims to analyze variations in the characteristics of the same sampling elements (individuals, companies, organizations, etc.) over a long period of time - often several years. An example of this happens when a researcher is interested in learning how children's moral development changes between the ages of three and five, to assess this development the researcher decides to follow them up to five years, periodically testing them over the years.