Free Marine Biology Course
Marine Biology and Ocean Ecosystems
A free marine biology course shows why ocean conditions matter to the life they support. Join the lessons to follow food webs, compare marine habitats, and understand how human activity affects organisms from plankton to whales.
About this course
The free marine biology course looks at ocean life together with the conditions that make it possible. You study light, salinity, temperature, and currents before examining organisms and the food webs they support. Following that connection helps you understand why a change in the water can affect much more than one species.
Ocean ecosystem lessons move from reefs and estuaries to the open ocean and deep-sea habitats, comparing how organisms meet different challenges. Marine conservation topics then connect human pressures with fisheries, protected species, and the work of NOAA in the US. You learn to ask what evidence is needed to understand an impact rather than assume every habitat responds in the same way. This is a foundation for further ocean science learning, not a fieldwork qualification or permission to handle wildlife.
Course outline
Charting the Field: An Introduction to Ocean Science
In this module, you’ll learn what marine biology covers, the history of ocean exploration, how marine life is classified, the major marine biomes, research tools, and key US research agencies.
The Physics and Chemistry Behind Every Wave and Current
In this module, you’ll learn salinity, temperature and density, ocean layers and light zones, currents and circulation, tides and waves, the carbon cycle and acidification, and El Niño.
Life at the Base: Microbes, Plankton, and Ocean Productivity
In this module, you’ll learn marine bacteria, archaea and viruses, phytoplankton and zooplankton, algae and seagrasses, how primary productivity works, the biological pump, harmful algal blooms, and plankton sampling.
Without a Backbone: Exploring Marine Invertebrate Diversity
In this module, you’ll learn the major invertebrate groups, from sponges, jellyfish and corals to mollusks, crustaceans and echinoderms, how reefs are built, cephalopod intelligence, and symbiosis.
Fins and Gills: The Biology of Marine Fish
In this module, you’ll learn fish classification from jawless to bony fish, shark biology and senses, how fish swim, breathe and regulate salt, deep-sea adaptations, and US commercial species.
Breathing Air at Sea: Marine Reptiles, Birds, and Mammals
In this module, you’ll learn sea turtle and sea snake biology, seabird adaptations, pinnipeds, cetaceans and sirenians, whale echolocation, stranding response, megafauna migration, and US protected species monitoring.
From Reefs to the Abyss: Mapping Marine Ecosystems
In this module, you’ll learn coral reefs, estuaries, mangroves, kelp forests, tide pools, beaches, the open ocean, hydrothermal vents and polar seas, plus food webs, trophic cascades and keystone species.
Protecting the Blue Planet: Human Impact and Conservation Careers
In this module, you’ll learn US fisheries management, bycatch, plastic and chemical pollution, climate impacts, NOAA, the ESA and MMPA, marine protected areas, citizen science, and career paths.
Get access to the complete curriculum once you enroll in the course
Frequently Asked Questions
Why does the marine biology course include ocean chemistry?
How do plankton fit into the free marine biology course?
Which marine habitats will I compare?
What will I study about marine invertebrates?
Does the course explain how fish cope with ocean conditions?
How are marine mammals and other air-breathing animals covered?
Where does NOAA appear in ocean conservation learning?
What human pressures does the course introduce?
Will I learn how marine food webs differ from a simple chain?
Are research methods part of beginner marine biology study?
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