They have spiny skins, internal skeletons and elaborate hydraulic systems used in locomotion and food getting--and they all live in the sea. Examining echinoderm life-styles shows that seastars (Class Asteroidea) are predators, brittle stars and basket stars (Class Ophiuroidea) are detritus feeders, urchins and sand dollars (Class Echinoidea) are herbivores, sea cucumbers (Class Holothuoidea) feed on detritus and plankton.

The structure, behavior, and life cycles of planarians and their free-living relatives (class Turbellaria). It illustrates the bizarre life cycles of flukes (class Trematoda) and tapeworms (class Cestoda) with detailed animations and revealing images of these parasites in action.

The structure, behavior, and life cycles of planarians and their free-living relatives (class Turbellaria). It illustrates the bizarre life cycles of flukes (class Trematoda) and tapeworms (class Cestoda) with detailed animations and revealing images of these parasites in action.

Fungi explores the structure, life cycles, ecology, classification, and evolutionary relationships of four major lines of fungi: Chytrids, Zygomycetes (various molds), Ascomycetes (yeasts, cup fungi, and most lichens), and Basidiomycetes (rusts and mushrooms).

Fungi explores the structure, life cycles, ecology, classification, and evolutionary relationships of four major lines of fungi: Chytrids, Zygomycetes (various molds), Ascomycetes (yeasts, cup fungi, and most lichens), and Basidiomycetes (rusts and mushrooms).

This module places many of the organisms studied in biology into an ecological perspective: hydras, planarians, annelids, aquatic insects, rotifers, and protists, all interesting organisms that provide food for fish and other vertebrates.

This module places many of the organisms studied in biology into an ecological perspective: hydras, planarians, annelids, aquatic insects, rotifers, and protists, all interesting organisms that provide food for fish and other vertebrates.

Detailed observations on chitons (class Polyplacophora), snails and nudibranchs (class Gastrapoda); clams, scallops, and mussels (class Bivalvia); tooth shells (class Scaphopoda); and squid and octopus (class Cephalopoda) with emphasis on their structures, behaviors, and adaptations.

Detailed observations on chitons (class Polyplacophora), snails and nudibranchs (class Gastrapoda); clams, scallops, and mussels (class Bivalvia); tooth shells (class Scaphopoda); and squid and octopus (class Cephalopoda) with emphasis on their structures, behaviors, and adaptations.

Clear graphic animation is used to describe the molecular level mechanisms of photosynthesis. Major plant groups include mosses, liverworts, ferns, horsetails, and the seed plants (gymnosperms and flowering plants). This is a good general introduction to the members of the green kingdom and their life cycles.

Clear graphic animation is used to describe the molecular level mechanisms of photosynthesis. Major plant groups include mosses, liverworts, ferns, horsetails, and the seed plants (gymnosperms and flowering plants). This is a good general introduction to the members of the green kingdom and their life cycles.

The term "protist" covers a wide range of microscopic organisms formerly clumped into "Kingdom Protista." New molecular analyses show that the protistan lines of evolution go so far back in time they can be considered as different kingdoms of life. Through stunning photography of living protists, students are introduced to amoebas, flagellates, algae, and the elegant ciliated protists in ten learning modules.

The term "protist" covers a wide range of microscopic organisms formerly clumped into "Kingdom Protista." New molecular analyses show that the protistan lines of evolution go so far back in time they can be considered as different kingdoms of life. Through stunning photography of living protists, students are introduced to amoebas, flagellates, algae, and the elegant ciliated protists in ten learning modules.

This Downloadable docs is a teacher's guide to accompany the "Branches on the Tree of Life: The Biology of Protists" video. Provides valuable background information and teaching suggestions.

Observations and up-to-date information on round worms including a number of important human parasites. Thirteen common rotifer species illustrate this diverse group of microscopic animals. Bryozoans have evolved remarkable filter-feeding strategies that are observed in freshwater and marine species. Gastrotrichs, tardigrades (water bears), nemerteans, and a recently discovered phylum, Gnathostomulida, acquaint students with many of the lesser-known branches of animal life.

Observations and up-to-date information on round worms including a number of important human parasites. Thirteen common rotifer species illustrate this diverse group of microscopic animals. Bryozoans have evolved remarkable filter-feeding strategies that are observed in freshwater and marine species. Gastrotrichs, tardigrades (water bears), nemerteans, and a recently discovered phylum, Gnathostomulida, acquaint students with many of the lesser-known branches of animal life.

The Biology of Seashores modular approach makes it ideal for teaching concepts of life science and ecology by focusing on intertidal ecology and the diversity of life found at the seashore.

The Biology of Seashores modular approach makes it ideal for teaching concepts of life science and ecology by focusing on intertidal ecology and the diversity of life found at the seashore.

Imagine an animal with no mouth, no digestive system, no excretory or circulatory organs, no brain nor nervous system, and no movement as an adult. In spite of their simple nature, sponges are actually one of the most fascinating animal phyla, when viewed in developmental, ecological, and evolutionary terms. Through animations and time-lapse microscopy, this program clarifies the structure, function, classification, and ecological roles of sponges.

Imagine an animal with no mouth, no digestive system, no excretory or circulatory organs, no brain nor nervous system, and no movement as an adult. In spite of their simple nature, sponges are actually one of the most fascinating animal phyla, when viewed in developmental, ecological, and evolutionary terms. Through animations and time-lapse microscopy, this program clarifies the structure, function, classification, and ecological roles of sponges.