Answer:
Population, community, ecosystem, and ecosphere.
Step-by-step explanation:
In the pyramid, from smallest to largest width are the population, community, ecosystem, and ecosphere. Population refers to the same group or species of organism who live in a particular geographical area that can interbreed with each other. Different populations living in a particular area is known as community. An ecosystem is a community of living organisms living with the nonliving components of their environment, interacting with each other. An ecosphere is a planetary closed ecological system.