Scientists tested the effect of a fertilizer on the growth of plants. they had 2 sets of plants, group a which gets fertilizer, water and sun and group b which gets only water and sun (but in equal amounts to group a).
1. explain how this scenario is a controlled experiment and identify the manipulated variable.

2. if the scientists only performed 1 experiment but it supported their hypothesis, why can it not be considered a theory?

3. the graph below was created showing the growth of the plant. how would you know that the y-axis is measuring the growth of the plant?

1.) Its a controlled experiment because both groups A and B get the equal mount of sunlight and water. The manipulated variable would be the fertilizer.

2.) Because a theory must consists of more than experiment before it can actually be considered a theory. It must be performed multiple times.

3.) Because if the growth was on the B spot, the graph would be a bar graph because the growth would still increase by each day.

there are no contact forces mentioned on the list of choices that you've provided.

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).