1. the noble gas krypton (Kr).
Experimental investigations<span> involve a process in which a "fair test" is designed and variables are actively manipulated, controlled, and measured in an effort to gather evidence to support or refute a </span>causal relationship<span>. Experimental investigations have a control group which does not receive any treatment. A classic example is "What is the effect of light color on plant growth?" In this experiment, the variable color of light is changed by the student. The student may compare red light to green light to natural light.
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Nitrogen is 78.08% of the air is fills the earth's atmosphere.
Answer: covalent bond
Explanation: Yeah that's the answer
Answer:
to build a house you need land and people
Explanation:
