They’re known as gateway drugs.
elements are pure substances composed of only one kind of atom. An example that is present in the body is oxygen which is present in the lungs and also in the blood. Compounds are composed of different types of atoms which differ in ratio from one to another. an example is water. The two terms are different in structure and hence the properties.
It’s B why do I have to write 20 characters
A Variety of instruments is needed to measure the change in the climate system because of B. The climate system involves several different factors that are measured differently
For example Wind and Temperature. Both of these factors will heavily affect the climate system but both these factors are so different and they need different instruments to be measured
