2020 Science Flash Card 2
vertebrates
animals or species that have a backbone
Invertebrates
animals or species without a backbone
Consumer
an organism that eats other organisms or organic matter
Ganglion
a mass of nerve cells
Gut
a digestive tract
Coelom
body cavity that contains internal organs
Bilateral Symmetry
two sides of its body mirror each other
Radial Symmetry
the body is organized around the center
Asymmetry
you cannot draw straight line to divide its body into two or more equal parts its body is not organized around a center
Sponges
the simplest invertebrate they are asymmetrical and have no tissues, gut, or neurons
Cnidarians
Cnidarians are more complex than sponges. they have tissues and a gut to digest food.
Flatworms
flatworms are the simplest words they are divided into three major classes planarians and Marine flatworms, flukes, and tapeworms.
Roundworms
not all round worms eat dead tissues. many roundworms are parasites. some of these roundworms, including pinworms and hookworms, infect human.
Mollusks
Nails, slugs, clams, oysters,, and octopuses are all mollusks. most of these animals are in the ocean. But some live in freshwater, on land.
Open circulatory system
a circulatory system in which the circulatory fluid is not contained entirely within vessels
