AP BIOLOGY

Detailed explanation-1: -Healthy ecosystems clean our water, purify our air, maintain our soil, regulate the climate, recycle nutrients and provide us with food. They provide raw materials and resources for medicines and other purposes. They are at the foundation of all civilisation and sustain our economies.

Detailed explanation-2: -Healthy communities rely on well-functioning ecosystems. They provide clean air, fresh water, medicines and food security. They also limit disease and stabilize the climate.

Detailed explanation-3: -Earth’s natural resources include air, water, soil, minerals, fuels, plants, and animals. Conservation is the practice of caring for these resources so all living things can benefit from them now and in the future. All the things we need to survive, such as food, water, air, and shelter, come from natural resources.

Detailed explanation-4: -While these models differ in the exact method of diversity estimation, they all include two important components: species richness and species evenness. Species richness is a measure of the number of different types of species in an ecosystem.