A group of similar cells that perform a specific function

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

A body plan in which any number of imaginary lines that all passed through a central point divide the animal into two mirror images

A body plant in which a single imaginary line divides the body into left and right sides that are mirror images of each other

Describe an animals’s body plan

The organization of an animals cells into higher levels of structure, including tissues, organs, and organ systems, helps to describe an animals body plan

Describe how the structures of animals are related to their symmetry

. In contrast, animals with radial symmetry have complex body plans with tissues and usually with organ systems. Animals with bilateral symmetry have organ systems.

Describe what asymmetrical body type means and give an animal example

Some animals have no symmetry, or are or asymmetrical. For example, most sponges are asymmetrical.

Describe what radial body symmetry means and give an animal example

An animal has radial symmetry if many imaginary lines can be drawn through a central point to divide it into two mirror images. For example, the shape of a jellyfish is circular. So any imaginary line drawn through it centered divides into mirror images.

Describe what bilateral body symmetry means and give an example of animal

An animal or an object has bilateral symmetry if only one line of symmetry can be drawn to divide it into halves that are mirror images. For example, a butterfly can be divided into half that are mirror images of each other.

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Science notecards

Chapter 4 lesson 2

Term	Definition
Tissue	A group of similar cells that perform a specific function
Organ	A body structure that is composed of different kinds of tissues that work together
Radial symmetry	A body plan in which any number of imaginary lines that all passed through a central point divide the animal into two mirror images
Bilateral symmetry	A body plant in which a single imaginary line divides the body into left and right sides that are mirror images of each other
Describe an animals’s body plan	The organization of an animals cells into higher levels of structure, including tissues, organs, and organ systems, helps to describe an animals body plan
Describe how the structures of animals are related to their symmetry	. In contrast, animals with radial symmetry have complex body plans with tissues and usually with organ systems. Animals with bilateral symmetry have organ systems.
Describe what asymmetrical body type means and give an animal example	Some animals have no symmetry, or are or asymmetrical. For example, most sponges are asymmetrical.
Describe what radial body symmetry means and give an animal example	An animal has radial symmetry if many imaginary lines can be drawn through a central point to divide it into two mirror images. For example, the shape of a jellyfish is circular. So any imaginary line drawn through it centered divides into mirror images.
Describe what bilateral body symmetry means and give an example of animal	An animal or an object has bilateral symmetry if only one line of symmetry can be drawn to divide it into halves that are mirror images. For example, a butterfly can be divided into half that are mirror images of each other.

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