Mark is a 9th grade biology student who just bought a small houseplant. Several days of intense studying caused Mark to forget to water his new houseplant. Mark knew that the vacuoles within each of the plant's cells were most likely filled with less water than they normally were. Mark reminded himself that vacuoles helped plant cells maintain their shape. However, Mark could not remember which other part of the plant cell helped provide them with structure. Which part of the plant cell is Mark forgetting? Group of answer choices The Ribosomes The Lysosomes The Cell Wall The Chloroplasts The Nucleus