*6th Grade Topic 10 Lesson 3 & 4

single-celled organisms that lack a nucleus; prokaryotes

• virus

• bacteria

• protist

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

• virus

• bacteria

• protist

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

• virus

• bacteria

• protist

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

• host

• vaccine

• parasite

an organism that provides a source of energy or a suitable environment for a parasite to live with

• host

• vaccine

• parasite

an organism that benefits by living with, on, or in a host in a parasitism interaction

• host

• vaccine

• parasite

a group of similar cells that perform a specific function

• tissue

• organ

• mammal

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

• tissue

• organ

• mammal

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

• tissue

• organ

• mammal

a low growing plant that lacks true vascular tissue for transporting materials

• vascular plants

• nonvascular plants

• invertebrates