Proteins consist of one or more polypeptide chains. Each polypeptide chain consists of smaller sub-units or amino acids that are linked together. Amino acids serve as the building blocks of polypeptides, and polypeptides serve as the building blocks of proteins
Hope that helped!!
A—
This sentence pretty much sums up what the writer of the passage wants to talk about. The other ones do not fit with the sentence “water is one factor that is necessary for growth” and do not fit the idea of the passage, which is what factors affect plant growth.
I think the correct answer is A
An informative speech aims to inform the audience about a specific topic. A persuasive speech aims to persuade the audience to perform a certain action or convince the audience to adopt the belief or opinion of the speaker. Many speeches will combine features of informative and persuasive speeches