Technically, there are an infinite number of possible amino acids, though we've found only 20 common ones that many organisms use and at least half a dozen obscure ones that specific organisms use. We focus only on the 20 common ones unless we're in a college level biochemistry course.
The three categories are nonpolar ones, polar ones, and charged ones. The nonpolar ones have non-polar side chains (no oxygens or nitrogens), the polar ones have polar side chains (most contain an OH group but no COOH group), the charged ones are either acidic or basic (has COOH group or a basic nitrogen).
Conglomerate rock, water and oil, a portion salad, trail mix, and concrete (not cement).
Answer: How do contrasting colors affect the quality of a painting?
Explanation:
The object study of science is objective phenomena, which are those phenomena that can be measured in a form that every ones agree because they do not depend on the particular subject that is involved in the study.
Color of light, mating behaviors of bees, soil pH, the productivity of fruit trees, temperature, and the amount of oxygen able to dissolve in water are variables or characteristics that can be objectively measured, so they can be perfectly object of study of and answered by science.
On the other hand, the ability to contrast color and the quality of paintings are characteristic that are subjective: they depend on the subject that assess such properties. This makes that a question like "How do contrasting colors affect the quality of a painting?" cannot be answered by science.
Answer:
Glass is used to help determine the hardness of a mineral.
Explanation:
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