A thunderstorm adds freshwater to the ocean. What does this do?.

Carlo is wondering what causes plants to grow at different rates. carlo’s hypothesis is “plants will grow more when the day is longer.” what would be the difference between the test group and the control group in this experiment? type of soil type of plants exposure to sunlight method for measuring the growth

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Which of the following always exist between two objects having mass ● elastic force ● contact force ●gravitational force ●magnetic force