Biological Hierarchy

The smallest basic unit of all living things is a

• cell

• tissue

• organism

• organ

What is an organism?

• One individual member of a species

• a group of individuals of a species

• all the different populations of a species that live in an area together

• a community of organisms and their physical environment

What is a population?

• One individual member of a species

• a group of individuals that belong to the same species and live in the same area

• all the different populations of species that live together in an area

• a community of species and the physical environment

Smallest unit of matter

• cell

• atom

• biosphere

• organism

similar ecosystems characterized by similar climatic conditions

• population

• molecule

• biome

• ecosystem

Populations of different species that live together and interact with one another

• population

• community

• ecosystem

• atoms

All the ecosystems on Earth

• biosphere

• biome

• population

• ecosystem

group of atoms

• atom

• cell

• molecules

• population

community and its nonliving surroundings

• biosphere

• ecosystem

• community

• population

Which order is correct from simplest to most complex?

• atom, molecule, biosphere, organism

• atom, cell, population, biome

• biosphere, community, organism, atom

• cell, ecosystem, population, atom