the basic unit of structure and function in living things

a living thing

the condition in which an organisms internal environment is kept stable in spite of changes in the external environment

an organism with many cells

a tiny, nonliving particle that enters and then reproduces inside a living cell

an organism that benefits by living with, on, or in a host and interacts

a vertebrate whose body temperature is regulated by its internal heat, and that has skin covered with hair or fur and glands that produce milk to feed its young

a group of similar organisms that can mate with each other and produce offspring that can also mate and reproduce

an animal with a backbone

a body structure that is composed of different kinds of tissues that work together

a group of similar cells that perform a specific function

a substance used that consists of pathogens that have been weakened or killed but can still trigger the body to produce chemicals that destroy the pathogens

the process by which unrelated organisms evolve similar characteristics

a eukaryotic organism that cannot be classified as an animal, plant, or fungus

single celled organisms that lack a nucleus; prokaryotes

Which characteristic of living things is represented in the picture?

What tool is needed to see cells?