1. Characteristics of Living Things
Chap 1-3
Pg 16-19

2. 1. Living things are made up of units called cells
A. ORGANISMS can be either:
Multicellular- made of more than
one cell. Ex: animals, plants
2. Unicellular-made of one cell.
Ex: amoeba

3. 2. Living things reproduce
A. Two kinds of reproduction:
1. Sexual Reproduction- cells from two different parents unite to form a new organism. Offspring are genetic combination of both parents.
2. Asexual Reproduction- the new organism comes from a single parent. Offspring identical to parent.

4. 3. Living things are based on a universal genetic code
The directions for inheritance are carried by a molecule called
Deoxyribonucleic Acid (DNA)
B. DNA codes the traits on the chromosomes that you inherit. Ex: baldness

5. 4. Living things grow and develop
Grow - Unicellular organisms may increase in size.
B. Develop - The cells of multicellular organisms begin to divide and differentiate (or specialize)

6. 5. Living things obtain and use materials and energy
Metabolism- the combination of chemical reactions through which an organism builds up or breaks down materials to carry out its life processes.
Examples:
1. Photosynthesis- building (plants)
2. Cellular respiration- breaking
down (plants and animals)

7. 6. Living things respond to their environment
a stimulus is a signal to which an
organism responds.
Ex: light and sound
B. Stimuli can be internal or external

8. 7. Living things maintain a stable internal environment
Homeostasis- the process in which an organisms internal conditions stay fairly constant in order to survive; means “same condition”
Ex: temperature- sweating/shivering

10. 8. Taken as a group, living things change over time
Evolution- A population of organisms
changes over thousands or millions of years through adaptations in order to survive

11. 8. Taken as a group, living things change over time

12. Now you try…