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What six things do living things have?

All living things have a cellular organization, contain similar chemicals, use energy, grow and develop, respond to their surroundings, and reproduce.

Cell

The basic unit of structure and function in an organism.

Unicellular

Single-celled organisms.

Multicellular

Organisms that are composed of many cells.

Development

The process of change that occurs during an organism's life to produce a more complex organism.

Stimulus

A change in an organism's surroundings that causes the organism to react.

Response

An action or change in behavior.

Reproduce

To produce offspring that are similar to the parents.

Spontaneous Generation

The mistaken idea that living things arise from nonliving things.

Controlled Experiment

In this experiment, a scientist carries out two tests that identical in every respect except for one factor.

Variable

The one factor that a scientist changes.

What four things do living things need?

Living things must satisfy their basic needs for energy, water, living space, and stable internal conditions.

Autotrophs

Organisms that make their own food.

Heterotrophs

Organisms that cannot make their own food.

Homeostatis

The maintenance of stable internal conditions despite changes in the surroundings.

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