19 terms

Biology Unit 1 hypothesis

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Science
is an organized way of gathering and analyzing evidence about the natural world.
Observation
the act of noticing and describing events or processes in a careful, orderly way.
Inference
is a logical interpretation based on what scientists already know.
Hypothesis
is a scientific explanation for a set of observations that can be tested in ways that support or reject it.
Controlled experiment
when only one variable is changed and all of the other variables stay unchanged or controlled.
Independent variable
is the one that deliberately changed
Dependent variable
the variable that is observed and that changes in response to the independent variable.
Control group
is exposed to the same conditions as the experimental group except for one independent variable.
Data
scientists make detailed records of experimental observations, gathering information.
Theory
a well-tested explanation that unifies a broad range of observations and hypotheses and that enables scientists to make accurate predictions about new situations.
Bias
is a particular preference or point of view that is personal, rather than scientific.
Biology
study of life.
DNA
all organisms store the complex information they need to live, grow, and reproduce in a genetic code written in a molecule
Stimulus
is a signal to which an organism responds.
Sexual reproduction
cells from two parents unite to form the first cell of a new organism.
asexual reproduction
in which a single organism produces offspring identical to itself.
Homeostasis
all organisms need to keep their internal environment relatively stable, even when external conditions change dramatically.
Metabolism
the combination of chemical reactions through which an organism builds up or breaks down materials.
Biosphere
part of earth in which life exists including land, water, and air or atomsphere.
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