Sean is thinking about using seawater to water his plants. Sean places 10 spider plants near a window for 20 days. Each day he

Question

Sean is thinking about using seawater to water his plants. Sean places 10 spider plants near a window for 20 days. Each day he waters five plants with 10ml of seawater and five plants with 10ml of fresh water. By measuring the height of the plants Sean collected: 
unreliable data 
quantitative data 
qualitative data 
control data

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