Chapter 1 Test

STUDY
PLAY
hypothesis
explanation for a question or a problem that can be scientifically tested
observation
using the senses to gather information
data
information
inference
logical interpretation based on prior knowledge and observations
theory
well tested explanation that unifies a broad range of observations
scientific method
a logical, systematic approach to the solution of a scientific problem
control
standard for comparison in an experiment
independent variable
factor in an experiment that researchers manipulate so that they can determine its effect
dependent variable
factor that changes as a result of a change in the independent variable
light microscope
microscope that uses a beam of light passing through one or more lenses to magnify an object
electron microscope
uses electrons to produce a magnified image of objects too small to be seen with a light microscope
metabolism
all of the chemical reactions that build or break down materials within an organism
evolution
change over time; process by which modern organisms descended from ancient organisms
species
two organisms that are so similar they can interbreed in nature and produce fertile offspring
ecosystem
all the organisms in a particular location, including their non-living environment
population
members of a species in a defined area
biosphere
part of Earth that living organisms inhabit
community
populations of different organisms living in a defined area
DNA
double stranded nucleic acid that stores and transmits genetic information
homeostasis
the process by which organisms keep their internal environment relatively stable
claim
a proposed answer to a scientific problem based on data
cell
basic unit of life
controlled variables
variables that remain constant in an experiment
asexual reproduction
reproduction with 1 parent; offspring are identical to parent
sexual reproduction
reproduction with the cells from 2 parents; increases genetic variety
organism
a single living thing
tissue
a group of cells working together
organ
a group of tissues working together
organ system
a group of organs working together