Themes in the Study of Life

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Inquiring About the World of Life

Evolution is the process of change that has transformed life on Earth

Biology is the scientific study of life

Biologists ask questions such as:

How a single cell develops into an organism

How the human mind works

How living things interact in communities

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Fig. 1-1

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Fig. 1-2

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Life defies a simple, one-sentence definition

Life is recognized by what living things do

Video: Seahorse Camouflage

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Order

Evolutionary adaptation

Response

to the

environment

Reproduction

Growth and

development

Energy

processing

Regulation

Fig. 1-3

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Fig. 1-3a

Order

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Fig. 1-3b

Evolutionary

adaptation

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Fig. 1-3c

Response

to the

environment

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Fig. 1-3d

Reproduction

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Fig. 1-3e

Growth and development

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Fig. 1-3f

Energy processing

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Fig. 1-3g

Regulation

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Concept 1.1: Themes connect the concepts of biology

Biology consists of more than memorizing factual details

Themes help to organize biological information

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Evolution, the Overarching Theme of Biology

Evolution makes sense of everything we know about living organisms

Organisms living on Earth are modified descendents of common ancestors

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Theme: New properties emerge at each level in the biological hierarchy

Life can be studied at different levels from molecules to the entire living planet

The study of life can be divided into different levels of biological organization