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kondaur [170]
3 years ago
15

Scientists are studying fertilizers to help grass grow in southern California. Fertilizer is any substance that can be added to

soil to help plants grow in it. In other words, fertilizer makes soil more fertile. The scientists set up different plots of land that all use the same type of soil and grass seed, but they use different types of fertilizer in each plot. Scientists then measure the grass growth in the different soils over time.
How should scientists set up the control group in this experiment?

A - a plot with grass seed but no fertilizer in the soil
B - a plot with grass seed and many types of fertilizer in the soil
C - a plot without any grass seed or any fertilizer in the soil
D - a plot without any grass seed but with fertilizer in the soil
Chemistry
2 answers:
blsea [12.9K]3 years ago
7 0
A) plot with grads seed / no fertiliser in the soil
Andrej [43]3 years ago
6 0

Answer:

The answer should be A

Explanation:

A control is basically something to compare the experiment to. In other words, to see how the object does on its own versus how it would do with added substances

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UNO [17]

Answer:

a) 0.15

Explanation:

A concentração de sacarose é 0,15 g / l no etanol. O Brasil está produzindo etanol em grandes quantidades que é usado como combustível em veículos e indústrias. Este etanol é produzido a partir da cultura da cana-de-açúcar e o Brasil é o segundo maior produtor mundial com cerca de 34,45 bilhões de litros em 2019. Os Estados Unidos da América e o Brasil produzem cerca de 84% do etanol mundial.

3 0
3 years ago
Protons have a positive charge true or false
aksik [14]

Answer:

True

Explanation:

Protons have a positive electrical of +1

6 0
2 years ago
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Kaylis [27]
The components are not permanently together. They can be separated and thats why its a mixture.
6 0
3 years ago
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Dominik [7]
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8 0
3 years ago
A divalent metal ion dissolved in dilute hydrochloric acid forms a precipitate when h2s is bubbled through the solution. which i
Alona [7]
Due to the cation forms a precipitate by adding H₂S in presence of HCl so this cation must be from group II cations 

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3 0
3 years ago
Read 2 more answers
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