Answer:
B) Nucleotide
Explanation:
This is because Nucleotides are made up of three things: Phosphate, Sugar, and a Base. Nucleotides are what make up DNA and RNA, and are considered the basic building blocks of DNA and RNA. To get a little off topic, the 4 bases types of bases are adenine, thymine, cytosine, and guanine.
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Yes, it is true that evolution is a theory, which is a well substantiated explanation for observable facts.
Evolution is change in the heritable characteristics of biological populations over successive generations. These characteristics are the expressions of genes that are passed on from parent to offspring during reproduction.
Different characteristics tend to exist within any given population as a result of mutation, genetic recombination and other sources of genetic variation.
Evolution occurs when evolutionary processes such as natural selection (including sexual selection) and genetic drift act on this variation, resulting in certain characteristics becoming more common or rare within a population.
The evolutionary pressures that determine whether a characteristic would be common or rare within a population constantly change, resulting in a change in heritable characteristics arising over successive generations. It is this process of evolution that has given rise to biodiversity at every level of biological organisation, including the levels of species, individual organisms and molecules.
Learn more about Evolution here : brainly.com/question/4207376
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The body's most important nonspecific defense against pathogens is the skin. The nonspecific defense system in the body guards against keeping infections from the body. Some of the nonspecific defenses are tears, mucus, and sweat among others. The correct answer will be D.
Answer:
DNA is often compared to a ladder becaause of its structure. The nucleotides form hydrogen bonds in a certain sequence, forming a "rung" of the ladder. The backbones of DNA are formed by alternating phosphates and sugar residues. Each nucleotide side attatches to 1 of the 2 backbones, creating a ladder shape.
