bony or boneless

8/14/2019 Bony or Boneless

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Bony or Boneless?


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HOW LONG?!

We can tell from fossils that living things

have been on Earth for over three billion(3,000,000,000) years. Those living thingswere not like you and me. They were verysmall and made of only one cell. A cell is thesmallest part of any living thing, and a human

being has trillions of cells, so you can see howsmall those living things were. Even thoughthey were tiny, they were alive.

QuickTime and adecompressor

are needed to see this picture.


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Our Ancestors

Those tiny things were the ancestors of allliving things today. We say that all life hasevolved from them. Evolution is a word

meaning change in living things overlong periods of time, producing newkinds of living things.




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A Sponge? Are youserious?

700 million (700,000,000) years ago, the

first animal did not look like a dog or acat. It was a sponge, a thing withouta brain or nerves or a backbone.

It sat on the bottom of the ocean and atebits of food in the water, but it was ananimal. Maybe that does not sound likean animal to you, but it does to azoologist.

Q u i c k T im e a n d ad e c o m p r e s so r

a re n e e d e d to s e e t h is p i c t .


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To a scientist, an animal is a living thing,made of many cells, that can move (atleast part of its life) and must eat otherliving things.

Animals are one of the five kingdoms

of living things.




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Animals are classifiedinto TWO large main

groups. 98 out of 100 types of

animals in the world todayare INVERTEBRATES, like asponge, because they do not

have backbones.

Animals with backbones arecalled VERTEBRATES, andthey have only been around

for about 500 million years.


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Invertebrates like insectsare the mostcommon typeof animal onEarth




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Why are people sointerested invertebrates, when thereare so few of them?

Vertebrate animals are abig part of human life.Humans have dogs and cats

as pets, they ride horses,they feed squirrels, andthey raise cows for meat.And, vertebrates can bemuch bigger than

invertebrates, so they areeasier to see.




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Any other reasons?

Oh yeah, human beings

are vertebrates, relatedto all the othervertebrates. If you feelyour back, you can feelthe bones running downthe center. That is yourbackbone.

The history ofvertebrate animals isthe history of you andme.

QuickTimdecompare needed


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Vertebrates are divided into five mainclasses: fish, amphibians, reptiles,birds, and mammals. All of these are

animals because they move around, aremade of many cells, and eat other living oronce-living things. They ALL havebackbones.




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Teacher Websites:

http://www.dmturner.org/Teacher/Libra

http://std2groupinganimals.blogspot.co
http://www.dmturner.org/Teacher/Library/4thText/VerPart1.htmlhttp://std2groupinganimals.blogspot.com/http://std2groupinganimals.blogspot.com/http://www.dmturner.org/Teacher/Library/4thText/VerPart1.htmlhttp://std2groupinganimals.blogspot.com/http://www.dmturner.org/Teacher/Library/4thText/VerPart1.html


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Task

Your teacher will now pass out a sheetwith pictures of animals, all jumbled

up. Your task is to separate out thevertebrates from the invertebrates andpresent your findings on a poster.

QuickTime and adecompressorare needed to see this picture.

bony or boneless

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