Needs and Characteristics

What are the four things all organisms need? What is the purpose of each?

• Air – gas exchange

• Water – chemical reactions and transport

• Nutrients – energy and building materials

• Living Space – provides shelter and resources

Memory Hint: All Wild Squirrels Nap

What are the 8 characteristics of life?

• Cells

• Homeostasis

• Energy Use

• Reproduction

• Response to Stimuli

• Growth and Development

• Genetic Code (DNA)

• Evolution

Memory Hint: Cool Hippos Eat Really Tasty Green Red Cherries

Explain how organisms are made of cells and maintain Homeostasis

cells：unicellular & multicellular

Maintain Homeostasis: The ability to maintain internal conditions in response to environmental changes

Explain how organisms use energy and reproduce

Use energy: ATP powers daily functions and repair/replacement of damage cells

Reproduce:

Sexual reproduction: Two parents produce offspring with different genes

Asexual reproduction: Single parent produce offering that is identical to parent, called a clone

Explain how organisms pass traits to offspring and grow

Pass traits: passed on through gene found in DNA(occurs during asexual or sexual reproduction)

Grow: can grow larger by cells increasing in number or size

Explain how organisms respond to changes in their environment And change overtime

Respond: Internal stimulus and external stimulus

Change overtime: Neutral selection(Individuals cannot evolve, Only population can)