Can anyone expain why it is important for non scientists to understand how scientists use the terms hypothesis, a guess and a theory

Nucleic acid certain protein cell membranes certain carbohydrates

Which of the following is not a possible effectof increasimg carbon dioxide levels in the atmosphere ?

What molecules will be best used to compare different species with the exact same sequence of amino acids? why would two species have the same protein even if the molecules in question is different? (hint: transcription to translation to protein).