A sample is a random, unbiased selection out of a larger group. An independent variable is one that is changed as to see how it will affect the dependent variable in an experiment.
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The answer is A. a light wave
C and D both need water as a medium and sound needs air to vibrate in order to travel. light, on the other hand, does not need a medium
Answer:
article 2
Explanation:
Article Two of the United States Constitution establishes the executive branch of the federal government, which carries out and enforces federal laws.
Might just be D must of them don't seem right to me
Answer: just write "onion cell microscope slide experment" as the topic
Explanation: To study the structure of the onion epidermal cell, with particular emphasis on the nucleus and nucleoli.As the cells observed do not have a cell wall, nor a prominent vacuole, the cells of the specimen on the slide are animal cells.