For an accurate measurement of cardiovascular activity, researchers typically: D) measure the number of heartbeats per minute.
<h3>What is cardiac cycle?</h3>
Cardiac cycle is a process that involves the complete heartbeat of the human heart, which comprises sequential alternating contraction and relaxation of the atria and ventricles, so as to cause blood to only flow in one direction throughout the human body during any cardiovascular activity.
As a general, researchers should typically measure the number of heartbeats of a person per minute, so as to ensure an accurate measurement of cardiovascular activity.
Read more on cardiovascular activity here: brainly.com/question/1578171
#SPJ1
Answer: Social Forces
Explanation:A social force is a force that result from unified opinion from the members of the community or society that bring about a social action that will lead to a social change . Social forces drive and motivate crucial changes within society.
The community came together against the supermarket and their unified opinion was able to influence the supermarket to change to using biodegradable plastics. There is power in numbers and this is what this community clearly used to stand for what they want and eliminate what they don't want;unified voice.
The correct answer is: Sample.
<u>A sample is the group of people, drawn from the accessible population, that is interviewed for a study to represent the entire population (or just a target population) in a research. </u>The selection of these individuals can occur through different sampling methods such as random sampling, stratified sampling, opportunity sampling and systematic sampling.