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Hi Joey, Piper, Lauren, and Ryan,
I like your team's hypothesis, it is straightforward and testable!
About the observations:
A. Have you guys been watering the bottles with the same amount of water?
B. What kind of fertilizer are you guys using? Are they solid (like grains) or are they aqueous (dissolved in water)?
C. It takes time for seeds to germinate and make it all the way up to the soil surface, so I'm sure you guys will see more seedlings very soon!
Here is a question to think about: why do you think fertilizers make plants grow better?
To answer you guys' questions:
1. I was always fascinated with the different morphology (physical traits) of different plants! There are different types of leaves, different flowers, different ways the plants make seeds, and I wanted to know about them all!
2. The color of the bottle shouldn't affect the growth of the plant, unless it is covering the plant, in which case would affect the light that is reaching the plant. Plants photosynthesize with a certain wavelength of light (red), so if the bottle blocks red light from the plant, the plant wouldn't be as happy.
3. I've not personally grown pearl millet, but a quick google search says 4-8ft.
Have a good weekend!
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