char of life.2012
DESCRIPTION
Power Point presentation for middle school life science students. Characteristics that living things share are listed with imagesTRANSCRIPT
We are all life scientists!
Chapter 1 What is Life?
Key Questions:
What are the Characteristics of Life?
What do living things need to survive?
Chapter 1 What is Life?
What are the Characteristics of Life?
All living things share six characteristics in combination.
These are human cheek cells. What kind of organism are you?
They are made of cells!
•An organism can be made of one single cell – unicellular.
•Or many cells as the building blocks of a larger organism – multicellular.Human cheek cells
400x
Cells are made of other chemicals!
• Proteins
• Carbohydrates
• Lipids
• Nucleic Acids
• Water
• These compounds make up all known life.
Living things respond to surroundings.• Stimulus - a reaction to a change
• Response – an action or behavior
Chapter 1 What is Life?
Living things respond to surroundings.Adaptation - an inherited behavior
or characteristic that enables an organism to survive & reproduce. This type of response takes a long time and many generations.
Over time, adaptations are modified by natural selection.
Chapter 1 What is Life?
Life is always changing…..
On the level of DNA……
Change = Evolution
Living things grow and develop. Grow = largerDevelop = more complex
Living organisms reproduce.
2 types: Sexual reproductionAsexual reproduction
What do living things need to survive?
• Water• Food
Autotroph/heterotroph• Living space• Stable internal
conditions – homeostasis
Test Yourself on these questions…A Short Quiz:
1. What are the six characteristics of life?
2. What is homeostasis? What is an example of homeostasis?3. Is a computer living? Why or why not?
4. Why is energy required by living things?