Answer:
ew... Decibels are measures of sound.
Explanation:
<em>because</em><em> </em><em>magnet</em><em> </em><em>attract</em><em> </em><em>opposite</em><em> </em><em>sides</em><em>.</em><em> </em><em>like</em><em> </em><em>north</em><em> </em><em>and</em><em> </em><em>south</em><em>.</em>
The following are four real life examples of the result of scientific investigation:
1. The development of the whole human genome.
2. The discovery of penicillin.
3. The discovery of a drug that cures tuberculosis.
4.The discovery that atoms have different energy levels and that electrons are found at each level.
All these events comes about as a result of scientific investigations.
C. By preventing flooding, creating reservoirs, and providing water for irrigation
The option that correctly compares a pure substance to a mixture is: B. A pure substance can only be separated by chemical means, whereas some mixtures can be separated by physical means.
A pure substance can be defined as a substance that has a definite and constant (fixed) structure and they are typically made up of only a kind of particles. Thus, a pure substance is a chemical substance that has a constant (fixed) chemical composition and properties.
As a result of a pure substance being a chemical substance, it cannot be separated into its constituents by a physical separation technique or method.
Instead, a pure substance being a chemical substance can only be separated by chemical separation technique or method.
In contrast, mixtures can be separated by a physical separation technique or method.
Find more information: brainly.com/question/24615100