The ozone layer reflects the suns heat hottest layer in the atmosphere
Answer:
D. as an arrangement of four chemical bases
Explanation:
Our DNA is made up of 4 chemical bases (adenine, thymine, guanine, cytosine).
I think it A I hope this help
Answer:
To understand the physical change and chemical change, one needs to know what is physical properties and what is the chemical properties of a substance.
Physical property is characteristic or trait of a substance that can be observed without converting the substance to a new substance. If there is any type of change in these physical properties like changing the appearance or form of matter and does not make a new substance, takes place it is called physical change.
A chemical change is a change in the matter of a substance that creates one or more new substances. This type of change includes the formation, color, of a precipitate, change in texture, and many other changes.
