Bacteria Bread moldMalaria protozoan Flatworm Paramecium Rotifer Roundworm Yeast SnailSpider Tree Sea lion.

BacteriaBread mold Malaria

protozoanFlatworm

ParameciumRotifer

RoundwormYeast

Snail Spider Tree Sea lion

Turtle PenguinHumans

Sea Sponge

WHAT DO ALL OF THESE THINGS HAVE IN COMMON?

-ALL living things are composed of one or more cells that perform all life’s processes.

Uni-cellular Multi-cellular

• High degree of order within an organisms internal and external parts (cellular level and beyond) and its ineractions with the living world.

Metabolism – using energy in chemical reactions. Energy is needed to maintain molecular & cellular structure as well as to grow & reproduce.

autotroph vs. heterotroph

-Homeostasis – maintain a stable internal environment.

-All living things must maintain a stable temperature, water, mineral & sugar content.

• Living things respond to stimulus (can be both internal or external)– Examples: Sense organs, such as the ear, and

sensory receptors, such as those in the skin, are sensitive to external stimuli such as sound and touch.

-Living things grow by cell division whereas non-living things grow by accumulating more material.-Development is a result of cell specialization – different cells having specific functions

Reproduction – to pass genetic material to new generation of offspring; necessary for the survival of the species.

•sexual reproduction - genetic material is combined from two organisms.

•asexual reproduction – One organism reproduces on its own. Ex: cells divide by a process called binary fission.

Yeast dividing: asexual

Mei Xing and new baby:

sexual

-Organisms within populations change through time, allows for survival in changing environment

-Adaptation – trait that makes a living thing better able to survive in their environment and produce offspring

-Explains diversity of life forms seen on Earth.

8. Living things respond to Stimuli – a physical or chemical change in the internal or external environment.

1. Composed of one or more cells.

2. Highly organized at both the cellular & multi-cellular level.

3. Use energy in chemical reactions. This energy is needed to maintain molecular & cellular structure as well as to grow & reproduce.

4. Homeostasis – maintain a stable internal environment. All living things must maintain a stable temperature, water, mineral & sugar content.

5. Living things grow and develop by cell division whereas non-living things grow by accumulating more material.

6. Reproduction is necessary for the survival of the species. In sexual reproduction genetic material is combined. In asexual reproduction, cells divide by a process called fission.

7. Adapt – acquire traits to become better suited to an environment.

Test Your Knowledge – Label each of the following situations as a characteristic of life

• If you put a plant under the microscope you can see thousands of little box structures.

• In a human, cells group to make tissue and tissue groups to make organs and organs group to make organ systems.

• At the eye doctor, drops were put into my eye which caused my pupil to dilate.• The cross country runners were dripping with sweat. • Hormones are causing noticeable changes in my 5th grade girls. • Jane ate a hot dog for lunch today.• In an embryo, 4 cells divide into 8 and 8 cells divide into 16 and so on.• Jillian is pregnant with twins.• There are millions of different organisms on Earth.• A bacteria cell got too big so it divided into two cells.

Assignment: Characteristics of Life and Diversity

It’s your turn to find a living thing that is very unusual and you know nothing about. Print it out to bring to class and explain why it is alive using the 8 characteristics of life.

Are Viruses Alive?• The idea that viruses are alive is a topic that is still

under debate by scientists all over the world. • Read the article provided and form an opinion

about whether viruses are a living organism or not. • Construct an argument writing piece with a claim

and counterclaim for a virus being alive and not being alive. You pick a stance and provide evidence for and against using the article and your textbook (viruses – Ch. 24).