Final answer:
The structures within an amoeba perform roles similar to organs in multicellular organisms, reflecting a level of complexity in which specific organelles carry out vital functions for the amoeba's survival. The correct answer is (option C) single-celled organisms are as complex as multicellular organisms.
Step-by-step explanation:
The question is asking us to make an inference based on information about how an amoeba, a single-celled organism, feeds and processes food. Specifically, an amoeba uses its cell membrane to engulf food by endocytosis, after which a lysosome fuses with the food vesicle to digest the food. Waste is then excreted from the amoeba by exocytosis. Organelles within the amoeba, similar to a multicellular organism's organs, perform specific functions vital to the amoeba's survival and function.
Given this information, the best inference we can make is that structures in amoebas perform functions similar to organs in multicellular organisms. This is because, like organs, these structures (organelles such as lysosomes) have specific roles in the life processes of the amoeba, indicating a level of complexity within this single-celled organism that reflects that of the organ systems in multicellular organisms.