CIENCIAS DE LA NATURALEZA1º DE E.S.O.

PRIMER TRIMESTRE FIRST TERM

Chapter 3:

Life on Earth

http://www.ancientlifepublishing.com/

LIVING THINGS have changed since the origin of life. They have evolved.

3.3.ORGANIZATION OF LIVING ORGANISMS

Origin of life (3.6–3.8 billion years ago)

http://www.pbs.org/wgbh/nova/evolution/brief-history-life.html

Launch the interactive in this web site and

answer:

The history of LIVING THINGS

Place in this 24 hours timeline the moment in

which the following species appeared

Snails

First land plants

Sharks

First insects

First reptiles

First conifers

First turtles

Lizards

Mammals

Frogs

Birds

1 second = 52.000 years

1 minute = 3.250.000 years

1 hour = 187.500.000 years

Heyday of dinosaurs

First hominids

Origin of life (3.6–3.8 billion years ago)

3.3.ORGANIZATION OF LIVING ORGANISMS

Biodiversity in this amount of living

things is really huge

http://www.historyshots.com/ViewInfo.cfm?Type=zoom&PID=4014

3.3.ORGANIZATION OF LIVING ORGANISMS

Living things can be classified as

unicellular organisms or multicellular organisms

Caenorhabditis elegans (blue) eating its main food source Escherichia coli (red) depicting serpins from diverse biological systems from unicellular to multicellular organisms.

http://www.jbc.org/content/285/32.cover-expansion http://jbashir.files.wordpress.com/2011/07/wormanatomy.jpg

A Colony of Escherichia Coli Bacteria

3.3.ORGANIZATION OF LIVING ORGANISMS

Unicellular organisms

http://www.jbc.org/content/285/32.cover-expansion http://jbashir.files.wordpress.com/2011/07/wormanatomy.jpg

A unicellular organism is formed by one single cell, which perfoms all the vital functions. They may be prokaryotic or eukaryotic

Paramecium caudatum(eukaryotic cell)

Ameoba proteus (eukaryotic cell)

BacteriaEscherichia coli (prokaryotic cell)

BacteriaSalmonella

typhimurium(prokaryotic cell)

3.3.ORGANIZATION OF LIVING ORGANISMS

Unicellular organismsA unicellular organism is formed by one single cell, which perfoms

all the vital functions. They may be prokaryotic or eukaryotic

Nutrition

http://www.youtube.com/watch?v=aWItglvTiLc http://www.youtube.com/watch?v

=V1644oLsfas&feature=related

Interaction

http://www.youtube.com/watch?v=YGZP0ijukt8&feature=related

http://www.youtube.com/watch?v=a4aZE5FQ284&feature=related

http://www.youtube.com/watch?v=DY9DNWcqxI4&feature=related

Reproduction

3.3.ORGANIZATION OF LIVING ORGANISMS

Multicellular organisms

A multicellular organism is formed by thousands of cells, and

perfoms all the vital functions.

They are organized according to increasing

levels of complexity.

Multicellular organisms may be prokaryotic or eukaryotic

3.3.ORGANIZATION OF LIVING ORGANISMS

LIVING THINGS evolve.

Unicellular organismsMultic

ellular

organisms

Proka

ryot

ic c

ells

Eukaryotic

cells

Autotrophs

Het

erot

roph

s

3.3.ORGANIZATION OF LIVING ORGANISMS