Answer:
D
Explanation:
Question: Scientists can use many strategies during investigations, including heldwork, surveys,
models, and experiments. Which of these phrases best describes an experiment?
A mathematical analysis of data
B. observation of animals in their natural world
Ci collection of data from an uncontrolled environment for comparative purposes
D. procedure with controlled conditions and test and outcome variables
A) a column
example: earth alkaline metals
Answer:
Hardness.
Lustre.
Colour.
Crystal Structure.
Explanation: hope i helped :0
Answer:
Air is a mixture, and the image shows that it is composed of different amounts of the same several pure substances.
Explanation:
water, O2, and carbon dioxide (all mixtures) are made of pure substances like hydrogen, oxygen, and carbon.
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