Mr. Greenjeans wants to know which fertilizer helps grow the biggest pumpkins. He plants three pumpkin seeds of the same variety and then uses three different types of fertilizer on the three seeds. The seeds receive the same amount of fertilizer, water and sunlight. Mr. Greenjeans monitors the pumpkin seeds' growth for three months. How could Mr. Greenjeans improve his experiment?
A) Mr. Greenjeans needs a control group for comparison.
B) Mr. Greenjeans should use corn and radish seeds as a comparison.
C) Mr. Greenjeans should use three different types of pumpkin seeds.
D) Mr. Greenjeans probably should monitor the pumpkins for a longer period of time.
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hope this helps
Mr. Greenjeans needs a control group for comparison.
How do we know that the fertilizer had any impact on growth since Mr. Greenjeans has no control group for comparison? He must know how the pumpkins will grow without any fertilizer as well. The control group gives us a way to compare the experimental groups to help form more valid conclusions.
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A rock made out of shells and corals cemented together is called a limestone.
A rock is a naturally occurring solid substance composed of one or more minerals or mineraloids.
- Limestone is a sedimentary rock that is composed mainly of calcium carbonate (
) in the form of the mineral calcite.
- Limestone forms from the accumulation of shells, coral, and other debris that have been deposited on the bottom of bodies of water such as oceans, lakes, and rivers.
- Over time, the weight of the overlying sediment compacts and cements the shells and other debris together to form solid rock.
Therefore, a limestone is a rock formed by the cementation of shells and corals.
Learn more about rock here:
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