Biology Chapter 1: Scientific study of life
What is life?
A combination of characteristics distinguishes life: organization, energy use, internal constancy, reproduction and development, and evolution.
Molecules form____________ inside many cells.
Consists of one or more cells
cells form _______ and then______ and __________
tissue, organs and organ systems
Individuals of the same species make up?
Multiple populations form?
Includes living communities plus their non-living environment
Make their own food, using energy and nutrients extracted form the non-living environment,
Eat other organisms living or dead.
Recycle nutrients to the non-living environment
What is a known outside energy source that all ecosystems require?
The Sun (heat)
What is homeostasis?
An internal constancy in changing environmental conditions.
Virtually identical copies of one parent
Genetic diversity by combining and scrambling DNA from two parents.
Environmental conditions select for organisms with inherited traits.
Increases the chance of survival and reproduction
Through natural selection explains how common ancestry unites all species, producing diverse organisms with many similarities.
The science of classification
Organisms according to probable evolutionary relationships.
Closely related species.
What are the two broadest taxonomic levels?
Domain and Kingdom
What are the three domains of life?
Bacteria, Archaea, and Eukarya
mode of nutrition and other features are distinguished by
A way of using evidence to evaluate ideas about the natural world.
A scientist makes observations raises questions, and uses reason to construct a testable explanation.
Follow from a scientific hypothesis
Ensures that published studies meet high standards for quality.
A test of a hypothesis carried out in controlled conditions.
The larger the _______ the more credible the results of an experiment.
Changeable elements in an experiment
The factor that the investigator manipulates
What the investigator measures to determine the outcome of the experiment.
Held constant for all subjects.
A set of subjects receiving no treatment also known as a placebo