Question

an equal amount of potting soil was placed in three identical pots. twenty petunia seeds were used. three seeds were planted in pot a, seven seeds in pot b, and ten seeds in pot c. the pots were all placed on the same table, and after they grew to a height of about 10 centimeters (cm), the plants from each pot were cut off at soil level, dried overnight, and weighed. the chart below shows the average plant mass from each pot. what is the variable that is being changed? the soil the temperature the mass of each plant the space available for each seed

Explanation:

In an experiment, the independent variable is the one that is changed. Here, the number of seeds per pot (3 in A, 7 in B, 10 in C) affects the space available for each seed. The soil is equal in all pots (so not a variable), temperature is same (as pots are on same table), and mass of each plant is the dependent variable (what is measured based on the change).

Answer:

the space available for each seed