ASAP HELP WITH HYPOTHESIS: Many plants can affect the growth of other plants near them. This can occur when one plant produces a chemical that affects another plant.
Create a hypothesis to determine if a solution containing ground-up goldenrod plants has an effect on the growth of radish seedlings.

Your hypothesis could be:
When planting the ground-up goldenrod plants next to the radish seedlings, I predict that the chemical coming out of the goldenrods, will choke out the oxygen and the carbon dioxide that the seedlings need to grow and thrive.

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ASAP HELP WITH HYPOTHESIS: Many plants can affect the growth of other plants near them. This can occur when one plant produces a chemical that affects another plant. Create a hypothesis to determine if a solution containing ground-up goldenrod plants has an effect on the growth of radish seedlings.

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ASAP HELP WITH HYPOTHESIS: Many plants can affect the growth of other plants near them. This can occur when one plant produces a chemical that affects another plant.
Create a hypothesis to determine if a solution containing ground-up goldenrod plants has an effect on the growth of radish seedlings.