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heterotroph

An organism that cannot make its own food.

autotroph

An organism that makes its own food

nucleus

Control center of the cell

cell

the basic structural and functional unit of all organisms

unicellular

Made of a single cell

multicellular

Consisting of many cells

organism

A living thing

stimulus

A change in an organism's surroundings that causes the organism to react

response

A reaction to a stimulus.

spontanous generation

the mistaken idea that living things can arise from nonliving sources

homeostasis

Process by which organisms maintain a relatively stable internal environment.

manipulated variable

Factor in an experiment that a scientist purposely changes; also known as independent variable

responding variable

The factor that may change in response to the manipulated variable

controle group

what the exparamental goup is being compared to

experimental group

A subject or group of subjects in an experiment that is exposed to the factor or condition being tested.

needs of living things

Water, food, living space, and stable internal conditions

6 characteristics of living things

chemicals of life,
energy use,
response to surroundings,
growth and development,
reproduction

experimental design

A design in which researchers manipulate an independent variable and measure a dependent variable to determine a cause-and-effect relationship

protist

eukaryotes tha cannot be classified by animals,plants or fungi

red tied

these are algal blooms that occur in salt water(diatoms)

holdfasts

anchor seaweed bodies to rocks

spore

A reproductive cell with a hard, protective coating

pigment

A chemical that produces color

algae

Grow in soil, on trees and on the bodies of turtles and frogs; smallest of all green plants

mutation

(genetics) any event that changes genetic structure

symbiosis

A close relationship between two species that benefits at least one of the species.

flagella

A long, whip-like filament that helps in cell motility. Many bacteria are flagellated, and sperm are flagellated.

contractile vacuole

saclike organelles that expand to collect excess water and contract to squeeze the water out of the cell

protozoan

Animal-like protist

pseudopod

A temporary, foot-like extension of a cell, used for locomotion or engulfing food

cilia

Hairlike projections that extend from the plasma membrane and are used for locomotion

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