Characteristics of Life

What is the most basic unit of life?

• cell
• tissue
• organ
• organ system

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Which of these is not true about all organisms?

• all living things have many cells
• all living things need water
• all living things respond to stimuli
• all living things reproduce

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For single-celled organisms, _____ is

mostly an increase in size.

Multicellular organisms go through a

process called __________, where cells

divide and differentiate into different

kinds of cells.

• Evolve, respond to stimulus

• Expansion, progress

• Growth, development

• Production, evolution

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A pill bug (roly poly) eats a carrot.

• All living things contain cells
• All living things use energy
• All living things maintain homeostasis
• All living things grow

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A tulip opens in the morning at sunrise and closes in the evening at sunset.

• All living things have cells
• All living things use energy
• All living things respond to their environment
• All living things grow

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Over three years, Tim's height has increased from 5'4" to 5'11".

• All living things contain cells
• All living things maintain homeostasis
• All living things use energy
• All living things grow

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A sea worm drops its tail and the tail becomes a new worm.

• All living things contain cells
• All living things grow
• All living things have different levels of organization
• All living things reproduce

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The roots of a plant grow towards a source of ground water.

• All living things use energy
• All living things reproduce
• All living things respond to their environment
• All living things grow

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Which is NOT a characteristic that all living organisms share? 

• Ability to reproduce 
• Ability to grow 
• Ability to respond to their environment 
• Ability to dominate an ecosystem 

A change in an organisms environment that causes the organism to react is called a

• Reaction

• Stimulus

• Weather

• Nerves