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🐠 Biodiversity and Ecosystem Health

From coral reefs to kelp forests, discover why the variety of life keeps ecosystems stable, what services it gives us for free, and what threatens it.

lessons

~15 min

to learn

🔬 Science

subject

Teens

level

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What you’ll learn

The Web of LifeDefine biodiversity, describe its three levels, and explain how keystone species hold ecosystems together.Biodiversity is the full variety of life in a place, measured at three levels: species, genetic, and ecosystem diversity. Some organisms are keystone species, like sea otters, whose presence holds an entire ecosystem together by keeping other species in balance.
Why Biodiversity MattersExplain the ecosystem services biodiversity provides and why greater variety makes ecosystems more stable.Biodiversity provides ecosystem services such as pollination, clean water and air, and medicines. Greater variety also makes ecosystems more resilient, because if one species is lost, others can fill its role, so diverse systems recover from disease and disturbance better than simple ones.
Threats and ProtectionIdentify the main threats to biodiversity (HIPPO) and recognize the signs of a healthy versus unhealthy ecosystem.Biodiversity is declining, driven mainly by human activity summed up as HIPPO: habitat loss, invasive species, pollution, population growth, and overharvesting, with habitat loss the biggest. Healthy ecosystems have many species, stable populations, and can recover from disturbance, while unhealthy ones lose variety and struggle to bounce back.

Questions this course answers

What does biodiversity mean?

Biodiversity is the full variety of life in a place, including different species, variety within them, and the range of habitats.

Which is an example of genetic diversity?

Genetic diversity is the variety among individuals within a single species.

What happens to a kelp forest if sea otters, a keystone species, disappear?

Without otters to eat them, sea urchins multiply and overgraze the kelp, collapsing the forest and the community that depends on it.

Which of these is an ecosystem service that biodiversity provides?

Ecosystem services include pollination, clean water and air, and medicines, benefits nature provides for free.

Why does more biodiversity make an ecosystem more stable?

Diversity acts like insurance: if one species is lost, a varied ecosystem has others that can take over its role and keep working.

What is the single biggest threat to biodiversity today?

Habitat loss, such as clearing forests and draining wetlands, is the largest driver of biodiversity decline.

Grounded in trusted sources

National Geographic
Smithsonian
Britannica
Understanding Evolution (UC Berkeley)

Every Wunder lesson is built from real, reputable sources — never invented.

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