Characteristics of Life

What is the most basic unit of life?

• cell
• tissue
• organ
• organ system

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A _____ is something in the environment that causes an organism to respond.

• stimulus
• response
• cause
• effect

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a life science that focuses on the study of living things

• biology

• chemistry

• physics

• science

Which of these is a characteristic of ALL living things?

• respond to external stimuli

• absorb complex food molecules

• produce offspring by means of sexual reproduction

• use energy to actively move through the environment

When a baby kitten becomes an adult cat, this is an example of...

• energy metabolism
• growth and development
• response to stimuli
• having cells

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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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The combination of chemical reactions through

which an organism builds up or breaks down

materials as it carries out its life processes is called ...

• absorption

• metabolism

• digestion

• consumption

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Maintaining a stable internal

environment is called

• homeostasis

• equilibrium

• balance

• evenness

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In order for something to be considered a living organism, it must display _____ of the characteristics of living things.

• all

• some

• one

• more than half

Rocks are not living because

• they never move
• they aren't needed for humans
• they are not made of cells
• they don't break down

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