Final answer:
According to Cell Theory, bacteria are considered to be alive, while viruses, proteins, and carbohydrates are not alive.
Step-by-step explanation:
According to Cell Theory, living things must meet certain criteria. Bacteria are considered to be alive because they have a cellular structure, reproduce, and carry out metabolic reactions. Viruses, on the other hand, are not considered to be alive because they do not have cells and cannot reproduce without a host cell. Proteins and carbohydrates are not alive as they are molecules and do not have the characteristics of living organisms.
Learn more about Cell Theory and characteristics of living organisms