I,3,4,7 hope this will help
Answer:
the answer is d
Explanation:
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A. The car ahead of you is turning
Because to demolish you need less labor, just a simple machine meanwhile to build something you need to take time to plan it out, design, etc.
A control variable is a scientific experiment in which the experimental element is unchanged throughout the experiment
a control group is a group in an experiment that does not receive the treatment by the researchers (untouched by them) and used to see the changes between the controlled group and that of the group that received the vial
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