1. A group of students sets up an investigation to test which type of soil helps a tomato plant grow the tallest. The students plant seed sprouts in three identical pots with three different types of soil.

1. A group of students sets up an investigation to test which type of soil helps a tomato plant grow the tallest. The students plant seed sprouts in three identical pots with three different types of soil. What is the experimental variable in the students’ test? (1 point)

the type of soil used in each pot
the amount each plant grows
the amount of sunlight each plant receives
the size and shape of the pot

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