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THE CLASSIFICATION SYSTEM. WHY do scientists classify living things?. Answer: Classifying living things makes it easier to find and share information about them. HOW do scientists classify living things?. Answer: All living things can be classified into

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Why do scientists classify living things
WHY do scientists classify living things?

Answer:

Classifying living things makes it

easier to find and share information

about them.


How do scientists classify living things
HOW do scientists classify living things?

Answer:

All living things can be classified into

one of five kingdoms. A kingdom is

the largest group into which living

things can be classified.


Every member of a kingdom

has some characteristics that

are the same as those of

other members.


THE CLASSIFICATION SYSTEM

The Five Kingdoms

Animals

Plants

Fungi

Protists

Monerans

Description:

Many-celled,

feed on living

or once living

things

Description:

Many-celled,

make their

own food

Description:

Most many-

celled, absorb

food from

other living

things or dead

things such

as logs

Description:

Most one-

celled, make

their own

food or feed

on living or

once living

things

Description:

One-celled,

no cell nuclei,

some make

their own

food, some

feed on living

or once-living

things

Examples:

Monkeys,

birds, frogs,

fish, spiders

Examples:

Trees,flowers,

grasses,

ferns,

mosses

Examples:

Mushrooms,

yeasts,

molds

Examples:

Algae,

amoebas,

diatoms

Examples:

Bacteria


Scientists divide the animal kingdom into

two large groups.

ANIMAL KINGDOM

Vertebrates

Animals

with

a backbone

Invertebrates

Animals

without

a backbone


VERTEBRATES

Mammals

Reptiles

Amphibians

Fish

Fish

Birds

Birds

Description:

Have hair

and produce

milk for

their young

Description:

Have dry,

scaly skin

Description:

Have moist

skin and no

scales, most

begin life in

water, but

live on land

as adults

Description:

Live their

entire lives

in water,

most have

hard scales

covering their

bodies and

gills to take

oxygen they

need from

the water

Description:

Live their

entire lives

in water,

most have

hard scales

covering their

bodies and

gills to take

oxygen they

need from

the water

Description:

Have feathers

to keep it

warm and

help some

to fly

Description:

Have feathers

to keep it

warm and

help some

to fly

Examples:

Cats, dogs

Examples:

Cats, dogs

Examples:

Lizards,

snakes,

turtles

Examples:

Lizards,

snakes,

turtles

Examples:

Frogs, toads,

newts

Examples:

Frogs, toads,

newts

Examples:

Sharks, eels,

bass, tuna

Examples:

Sharks, eels,

bass, tuna

Examples:

Owls, robins,

parrots,

penguins

Examples:

Owls, robins,

parrots,

penguins


INVERTEBRATES

Arthropods

Mollusks

Worms

Description:

Have legs with

several joints,bodies

have two or more

parts, often

have an outer

covering that

protects them

Description:

May or may

not have a

hard outer shell

Description:

Have no shells,

legs, or eyes

Examples:

Insects such as

beetles,bees,and spiders

such as mites,horseshoe

crabs, and scorpions

Examples:

Snails, clams,

squids

Examples:

Earthworms,

tapeworms,

flatworms


Forming Smaller Groups

Scientists study the living things in each kingdom to see how they are alike and how they are different.

They use characteristics to make smaller and smaller groups, and they give each smaller group a name.

The most specific classification groups have only one type of living thing.


Classification of a House Cat

Kingdom: Animalia

Phylum:   Chordata

Class:   Mammalia

Order:   Carnivora

Family:  Felidae

Genus:   Felis

Species:   domesticus


Most living things have a common name such as house cat. But common names may be different in different places.

For this reason, scientists name animals with the labels of the two smallest classification groups.


The name of the second smallest group, the genus, is joined with the name of the smallest group, the species.

The scientific name for

a house cat is

Felis

domesticus.


Summary
Summary

Scientists organize living things to make

studying and discussing them easier.

Scientists classify all living things into five kingdoms – animals, plants, fungi, protist, and monerans.

The five kingdoms are divided into smaller groups.


Vertebrates such as mammals, reptiles,

amphibians, birds, and fish, have backbones.

Invertebrate animals, such as arthropods, mollusks, and worms, do not have backbones.


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