suggested, testable answer to a well-defined scientific questions
any factor in an experiment or scientific study that can change in value
experiment that tests the effect of a single variable
use of the senses (sometimes aided with instruments) to gather information about something in nature.
logical conclusion based on observations
logical explanation based on multiple observations
all parts of the planet that are inhabited by living things, sum of all ecoregions
large areas of the biosphere dominated by a particular climate, sum of multiple ecosystems.
an area within an ecoregion composed of living and abiotic features.
all members of a particular species that exist in a particular ecosystem.
all organisms that interact with a particular species within a particular ecosystem.
an individual living thing.
a collection of organs within a particular individual that together perform a function.
a collection of tissues that perform a particular function within an organ system.
a collection of cells that perform a particular function within an organ
fundamental units of living organisms.
long molecule that carries genetic information within a cell.
portion of the DNA molecule coding for a particular genetic trait.
distinct form of life (members of a population that interbreed and produce fertile offspring).
broadest category used to classify living organisms.
organisms composed of one cell.
organisms composed of more than one cell.
cells lacking a nucleus and other internal organization, always unicellular.
cells containing nucleus and other features of internal organization.
complex organization formed from a simpler combination of parts.
process by which plants use the sun's energy to convert water and carbon dioxide into sugars.
an organism that makes its own food.
an organism that must consume other organisms in order to obtain food.
internal stability or steady state maintained by the body.
inherited characteristic that improves an organism's ability to survive and reproduce in a particular environment.
process by which individuals with inherited characteristics well suited for the environment leave more offspring than other organisms.
generation to generation change in the proportion of different inherited genes in a population accounting for change in the form of that organism over time.