N an experiment the "control" is the group of people or object this is used to measure the effect of the variable. The "control" is the thing that does not change and is not the thing in question.
In an experiment the "variable" is the thing which is changed and manipulated by the experimenter. It is the effect of something,
Example: You want to test a drug. you get a group of 40 people. 20 people are given the pill, 20 people are not given the pill but a sugar pill. the people who have the pill is the "variable" and the people who dont have the pill is the "control".
To avoid ths food should be kept at What should food workers do to prevent pests from finding food in garbage cans what structures are used for capturing prey and securing and eating food in a crayfish What is the best way to prevent poor food safety
Outer membrane or plasma membrane, cytoplasm, nucleus, ribosomes,
Answer:
to prevent the virus to have a big effect on the body of humans so the cells can fight against it
