Organization of Life

What is the theory of natural selection?

• An inherited trait that helps an organism to survive.

• The practice by which humans select plants or animals for breeding based on desired traits.

• The process by which individuals that are better adapted to their environment survive and reproduce more successfully than less well adapted individuals.

• It occurs in all members of a species.

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The theory of natural selection was introduced by (a)   .

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Which is classified as an ecosystem?

• a bumble bee
• a bee hive
• bees, grass, trees, birds, frogs
• bees, grass, frogs, water, sunlight

Which of these is the basic unit of life in all living things?

• tissue
• organ
• cell
• atom

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If you see cardinals, blue jays and owls in your back yard, this is an example of a 

• community
• population
• ecosystem
• species

Organs and tissues that perform the same function is called _____________?

• cells
• tissues 
• organ system
• organs

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A group of tissues that perform a similar function is called_____. (Examples include the heart, lungs or stomach)

• cells
• tissues
• organs
• organ system

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What is the correct ordering of life from smallest to largest?

• Organism, organ, organ system, tissue, atom, molecule cell, organelles 
• organism, organ system, organ, tissue, cell, organelle, molecule, atom
• atom, molecule, organelle, cell, tissue, organ, organ system, organism
• All choices are correct

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What is not a basic characteristic of life?

• Responding to the environment
• They grow, reproduce, and expel waste
• Hunting other organisms for survival and territory
• They obtain nutrients for energy 

What is an organism?

• a group of similar cells that perform a common function
• a group of organs working together to do a job in the body
• a collection of tissues that work together
• a living thing 

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