Answer:
5. A(so that the organisms are easier to study.)
1. D(drinking water)
2. already correct good job
3. A(they are made of at least one cell)
4. D(the scientific study of how living things are classified.)
Explanation:
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Layer D is the youngest layer
Answer:
Argon
Explanation:
The element that has a complete valence electron shell is argon (Ar) since it is a noble gas in the last group on the periodic table. destinymitchell966