<span>Controlled variable is a variable that was made constant in the research. That was because the controlled variables can influence the dependent or independent variable. If the variables is not made constant, it can alter the research result and made it invalid.
In this case, </span>the caffeine and alcohol intake might alter the physical activity or the blood glucose so it should be controlled.
<span>Based on a study of recreational drugs that have been linked with a higher incidence of sudden infant death syndrome was the use of Marijuana and other recreational drugs like cocaine, crack, crystal, amphetamine, methamphetamine, and speed but cocaine was the most commonly used drug. The basis of the infant sudden death was that both maternal and paternal were using at the time of conception and during in the latter stage of pregnancy. Tobacco smoking of the mother during pregnancy can also affect the life of the baby. There is statistics base on the study on how many percents it will affect the condition of the infant.</span>
Answer:
True
Explanation:
Because of Pangea, they show evidence of fossils deep underground in different continents
The answer is <span>D) myofibrils
And the myofibrils are composed of sarcomeres
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