C. by observing them in their habitats
Ex: The Galapagos Islands. Darwin went their to study the flora and fauna in their natural habitat.
Answer:
Carbs - provide your body with energy.
Lipids - serve as structural components of cell membrane, function as energy storehouses, and function as important signaling molecules.
Protein - helps with growth and maintenance of tissues, enzymes that cause biochemical reactions in and out of your cells, some proteins are hormones so it acts as a messenger the aid communication between your cells, tissues, and organs. And many other thing that are a google search away.
Nucleic Acids - hold storage and expression of genetic information
Earth's atmosphere is 78%<span> nitrogen </span>21%<span> oxygen, </span>0.9%<span> argon, and </span>0.03%<span> carbon dioxide with very small percentages of other elements.
hope it helps</span>
The answer to this question would be: <span>lung cancer
In 1950, the medical practitioner doesn't know the relation of cigarette smoking with lung cancer. In that era smoking advertising is very massive and some physician even helps it. This cause increased amount of lung cancer incidence. The amount of lung cancer continues to increase till 1980-1990</span>
