Covered with hair-like structures used in eating, locomotion, and respiration; common among sand grains, eating plant cells and bacteria.

• Dinoflagellates

• Ciliates

• Diatoms

• Sarcodinians

Propel themselves using 2 flagella; can swim like simple animals; photosynthesize like plants; causes Red Tides

• Sarcodinians

• Ciliates

• Diatoms

• Dinoflagellates

Blue-green algae found in freshwater lakes, streams, oceans, damp soil, moistened rocks and even sloth fur; can lead to a depletion of oxygen in the water and a release of toxins.

• Foraminiferans

• Archaebacteria

• Radiolarians

• Cyanobacteria

Unicellular organisms that can easily survive in such extreme environment as sea vents releasing sulfide-rich gases, hot springs, or around volcanoes.

• Archaebacteria

• Radiolarians

• Cyanobacteria

• Foraminiferans

Microscopic plant-like organisms that photosynthesize (bacteria or protists); bottom of the aquatic food chain; highly dependent on available nutrients.

• Holoplankton

• Phytoplankton

• Meroplankton

• Zooplankton

Microscopic animals that cannot make their own food; floating or weakly swimming animals that rely on water currents to move any great distance.

• Holoplankton

• Meroplankton

• Phytoplankton

• Zooplankton

Only spends a larval or reproductive stage as part of the plankton:

• Meroplankton

• Phytoplankton

• Holoplankton

• Zooplankton

Spends their entire lives as part of the plankton:

• Meroplankton

• Phytoplankton

• Holoplankton

• Zooplankton

Most modern systems of classification are based on _______________ among organisms

• Autotroph

• Evolutionary relationships

• Water

• Cladogram

classification systems based on phylogeny organize species or other groups in ways that reflect our understanding of how they evolved from their _______________.

• Photosynthesis

• Dichotomous key

• Common ancestors

• Phylogenetic tree