Answer:
Chemical reactions involve the rearrangement of electrons and Isotopes of the same element behave differently in a nuclear reaction.
The correct answer to your question is<span> The common nucleic acid sequences of polar bears and black bears can be deduced from their classification in the same genus, Ursus. In this sentence, it will explain that there is a hierarchy among organism and by the word "genus", this means this is one of the part of the hierarchy.</span>
Organic compounds, such as carbohydrates, lipids, proteins and nucleic acids within the human body are referred as macronutrients.
These various macronutrients play different role in body like carbohydrates are used for energy (glucose). Fats are used to break food into fatty acids and protein helps in making hormones and muscles.
These macronutrient helps in the prevention of disease, provide energy to the body. All the macromolecules except the lipids are known as polymers.
Polymers are the natural or synthetic substance that are composed of large molecules that is called macromolecules.
To learn more about polymer here
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I would say 2 but i might be wrong
