C: depositing silt, which created rich soul for growing crops.
I believe the answer is b
Answer:
many unknown variables that directly affect the individual's heart health condition.
Explanation:
The problem with this conclusion is that there are many unknown variables that directly affect the individual's heart health condition. Their socioeconomic status is one such variable since this determines whether or not the individual is able to afford the right types of food, healthcare, medicine, etc. All of these are vital components of maintaining a healthy heart and preventing heart disease. Ancestral health histories are also an important variable to take into consideration in this scenario but it was not. Therefore, the data gathered is not very reliable.
A group used in a study or in an experiment, which does not get treatment by the scientists and is used as a foundation to determine the functions of the other tested subjects is known as the control group. The control group is only found in an experimental investigation.
The answer to this question is a love and commitment