---
title: "Biodiversity & Resilience"
description: "Explain biodiversity at species, genetic, and ecosystem levels, how diversity can support ecosystem resilience, and how habitat destruction, pollution, invasive species, and climate change can reduce "
canonical: https://lightmysky.com/learn/science/biodiversity-and-resilience-mt_xSs0xAd6i1
source: https://lightmysky.com/learn/science/biodiversity-and-resilience-mt_xSs0xAd6i1.md
retrieved: 2026-11-12
---

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# Biodiversity & Resilience

Explain biodiversity at species, genetic, and ecosystem levels, how diversity can support ecosystem resilience, and how habitat destruction, pollution, invasive species, and climate change can reduce biodiversity

Subject: Science · Area: Ecosystems & Habitats · Ages 12 to 14
Page: https://lightmysky.com/learn/science/biodiversity-and-resilience-mt_xSs0xAd6i1

## Ready when they can

- Defines biodiversity at the species, genetic, and ecosystem levels
- Explains how biodiversity can help an ecosystem keep functioning and recover after disruption, without guaranteeing recovery
- Identifies at least three human activities that reduce biodiversity
- Discusses why biodiversity loss matters for humans as well as wildlife

## Lesson: Biodiversity and ecosystem resilience

Biodiversity is the variety of life. Species diversity includes the number of species present, called species richness, and the relative numbers of individuals in each species. Genetic diversity means inherited differences within one species. Ecosystem diversity is the variety of ecosystems across a region, such as forests, rivers, and reefs. Rainfall affects living conditions but is not a level of biodiversity.

*(drawing: Invented surveys of equal-sized patches used the same method. Patch A has greater species richness: eight species compared with three.)*

Resilience is an ecosystem's ability to keep functioning through a disturbance and recover afterward. Food webs show how species depend on one another. If several insect species pollinate the same flowers, unaffected species may keep pollination going when one declines. Diversity can help when species do similar jobs but respond differently to a disturbance. It does not guarantee recovery.

**Example.** Human activities can reduce biodiversity in different ways. Clearing habitat for construction removes living space. Releasing toxic waste into water is pollution that can harm organisms. Burning fossil fuels adds greenhouse gases, driving climate change that can make habitats unsuitable. To identify a pressure, link the activity to what it changes and how that affects living things.

Habitat destruction removes living space and resources. Pollution can harm organisms. Invasive species are introduced outside their native range and cause, or can cause, harm there. They may outcompete or eat native species, causing local losses. Not every introduced species is invasive. Human-caused climate change can make habitats unsuitable. Overharvesting removes organisms faster than populations can replace them. These pressures can reduce biodiversity.

People depend on ecosystems for food, water filtering, and organisms used to develop medicines. Clearing a local forest can remove habitats, disrupt food webs, and reduce these benefits for nearby people. Species surviving elsewhere do not replace the lost local links. Restoring habitat can help, but it does not guarantee that every species or interaction returns.

**Recap.** Biodiversity includes species, genetic, and ecosystem variety. It can support resilience. Human pressures can reduce biodiversity and harm wildlife and people.

*Lesson, questions and flashcards written for this dataset. Survey charts and meadow comparisons are invented teaching examples.*

## Practice

8 questions on this page, each with its working shown.

## Needs first

- [Food Webs & Interdependence](https://lightmysky.com/learn/science/food-webs-and-interdependence-mt_URTJbS3hhs)

## Optional connections

- [Communities Protecting Resources](https://lightmysky.com/learn/science/communities-protecting-resources-mt_7e-lG7YOWa)
- [Species Distribution & Change](https://lightmysky.com/learn/science/species-distribution-and-change-mt_JSUGQ5Repv)
- [Toxins in Food Chains and Organisms Changing Habitats](https://lightmysky.com/learn/science/toxins-in-food-chains-and-organisms-changing-habitats-mt_YvCgDM0Scg)