Biology Steve Stein

A living thing.

• organism

• cell

• response

• stimulus

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The basic unit of structure and function in living things.

• organism

• cell

• response

• stimulus

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Any change or signal in the environment that can make an organism react in some way.

• organism

• cell

• response

• stimulus

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An action or change in behavior that occurs as a result of a stimulus.

• organism

• cell

• response

• stimulus

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__________ organisms consist of many cells. Humans are __________ organisms with trillions of cells specialized to do certain tasks.

• single celled

• multicellular

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The most common chemical in cells is ___________, which is essential for life.

• carbohydrates

• water

• protein

• lipids

All organisms need ________ to power their cells.

• stimuli

• energy

• sunlight

• to eat

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Some organisms, called __________, can get energy from sunlight in a process known as photosynthesis.

• producers

• consumers

• decomposers

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Some organisms, called ___________, get energy by eating other living things.

• producers

• consumers

• decomposers

A group of similar organisms that can mate with each other and produce offspring that can also mate and reproduce.

• species

• domain

• genus

• taxonomy