Justin is planning his science fair project. he wants to measure how oxygen levels affect the rate of photosynthesis in plants. is this an example of a scientific investigation or an experiment?

group of answer choices

an experiment because it tests a cause and effect relationship

an experiment because it does not ask a testable question

an investigation because it uses only observations

an investigation because there is a control group

1.aluminum chloride (alcl3), and sodium hydroxide (naoh) can react to form aluminum hydroxide (al(oh)3) and sodium chloride (nacl).    you have 13.4 g of aluminum chloride and 10.0 g of sodium hydroxide. answer the following questions: •what is the balanced equation for this reaction? •if you use all 13.4 g of aluminum chloride, how many grams of aluminum hydroxide can be formed? work must be shown to earn credit •if you use all 10.0 g of sodium hydroxide, how many grams of aluminum hydroxide can be formed? work must be shown to earn credit •how many grams of aluminum hydroxide will actually be made?     which reagent is limiting? explain your answer.

This drawing shows a human body system. what is the primary function of this body system?

If two atoms are bonded to a central atom with no lone pairs,how will they be arranged