What is biology?

• Study of life

Characteristics of life

1. Made of one or more cells2. Displays organization3. Grows and develops4. Reproduces5. Responds to stimuli6. Requires energy7. Maintain homeostasis8. Adaptations evolve over time

Characteristics of life

1. Made of one or more cellsa. Basic unit of life – exhibit all characteristics of lifeb. Unicellular – one cellc. Multicellular – many cells

2. Displays organizationa. Arranged in an orderly wayb. Cells have many parts that contribute to whole

Characteristics of life3. Grows and develops

a. Add mass or more cellsb. Develop – natural changes during the life of organism

4. Reproducesa. Produce offspring – pass on DNA!!b. Reproduce as a species not individual

5. Responds to stimulia. React to factors outside/inside organismb. Plants and sunc. Predators/prey

6. Maintain homeostasisa. Keeping internal conditions stable/within a tolerable range

Human body temperature is………

if body temperature rises, you sweat.

if body temperature lowers, you shiver.

7. Requires energy***Metabolism - biochemical reactions that acquire & use energy

Why do organisms need energy?

How do organisms obtain energy?

8. Adapts over timea. inherited changes that occur over time

A Short Quiz:1. What are the characteristics of life?

2. What is homeostasis? What is an example of homeostasis?

3. Is a computer living? Why or why not? Is a virus living?

4. Why is energy required by living things?

Life is Diverse

Biodiversity refers to the many different types of organisms on earth.

Taxonomy is the biological science that classifies life according to evolutionary relationships.

The Domain is the largest group of organisms.

Life is Diverse

Life is Diverse

Kingdom Phylum

Class Order

Family Genus

Species

Kings Play Chess On Fine Green Squares

Life is Diverse

Human classification scheme:

Domain Eukarya

Kingdom Animalia

Phylum Chordata

Class Mammalia

Order Primates

Family Hominidae

Genus & species Homo sapiens

What is Life: Martian and the Car

Below is a description of a car Marty the Martian believes to be alive. From his description give examples of why the car is and is

not alive.

At the trial, Marty spoke in his defense. "I first saw these life forms rolling along roads in great numbers. They were giving off thick clouds of poisonous waste as they moved. They seemed to exhibit herding behavior, as many of the cars moved in the same direction. They appeared to have a great deal of energy, some of them moved faster than 75 miles per hour. When one of these life forms stopped or slowed down, the others behind it responded. They slowed down and gave off a reddish light from the back, and sometimes they would make honking noises. I observed that they would stop to feed on a liquid substance."

Have your completed homework out for me to check.

Agenda for Thursday Dec 19th 1. TEST