<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.
The answer is the last one
The polymerase chain reaction makes DNA fingerprinting more reliable because it allows scientists to quickly make many copies of DNA the answer is C
It will increase the amount of mosquitoes which will shift the ecosystem this will give many predators more to food to reproduce which will lead to a shortage of flying insects. hope this helps
Any plant that have ceased elongation. Ex. Hemp and flax
