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Most protists are one-celled organisms.


Animal-like protists.

Saltwater blooms (Red Tide)

An algal bloom that occurs in salt water because of an increase in nutrients in the water. They are dangerous when the toxins that the algae produce become concentrated in the bodies of organisms that consume the algae.

Fungus-like protists

Heterotrophs which have cell walls, and use spores to reproduce. They are able to move at some point in their lives. The three types of funguslike protists are slime molds, water molds, and downy mildews.


Animal-like protists that capture food using pseudopods.

Freshwater Algal blooms

Or eutrophication is when a layer of algae prevents sunlight from reaching plants and other algae beneath the surface. Those organisms die and sink to the bottom. Then decomposers increase in number and use up the oxygen in the water. Without oxygen, fishes and other organisms in the water die.

Euglenoids (Euglena)

Green, unicellular algae that are found mostly in fresh water. Unlike other algae, euglenoids have one animal-like characteristic—they can be heterotrophs under certain conditions.


Are a type of unicellular plantlike protists with glasslike cell walls.

Contractile Vacuole

Freshwater protozoans use this to pump excess water out of its body.


A close relationship between two species in which at least one organism benefits.

Slime Molds

A fungus-like protists that sometimes creep together to form a multicellular mass.


The buildup over time of nutrients in freshwater lakes and ponds that leads to an increase in the growth of algae.


A tiny cell that is able to grow into a new organism.


A "false foot" or temporary bulge of cytoplasm used for feeding and movement in some protozoans, such as the Amoeba.


A eukaryotic organism that cannot be classified as an animal, plant, or fungus.


The hairlike projections on the outside of cells that move in a wavelike manner.

Brown Algae

Commonly known as seaweed or giant kelp, contains many colored pigments and air bladders.


Plantlike protists that can be unicellular or multicellular, are autotrophs and depending on their pigments, can be green, yellow, red, brown, orange, or even black.


A chemical that produces color.


A type of symbiosis in which both partners benefit from living together.


Animal-like protists from the group of Sarcodines that live in either water or soil. They feed on bacteria and smaller protists with their pseudopods.


Ciliates that live mostly in fresh water. They feed on bacteria and smaller protists. They use cilia to move and feed.


Long, whiplike structures used to move flagellates.


Protozoans that have flagella for movement.

Animal-like Protists

Or protozoans are unicellular, heterotrophs and can be classified into four groups, based on the way they move and live. Most are able to move from place to place to obtain food.

Plant-like Protists

Commonly called algae, are extremely diverse. Like plants, algae are autotrophs. Most are able to use the sun's energy to make their own food.

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