AP BIOLOGY

Detailed explanation-1: -Decomposers play a critical role in the flow of energy through an ecosystem. They break apart dead organisms into simpler inorganic materials, making nutrients available to primary producers.

Detailed explanation-2: -Thus, the four main levels of biodiversity are species, genetic, ecosystem, and global biodiversity.

Detailed explanation-3: -Biodiversity is the key indicator of the health of an ecosystem. A wide variety of species will cope better with threats than a limited number of them in large populations. Even if certain species are affected by pollution, climate change or human activities, the ecosystem as a whole may adapt and survive.

Detailed explanation-4: -Biodiversity, which encompasses species, ecosystems, and genetic diversity, provides invaluable ecosystem services (including raw materials for many sectors of the economy) and plays an essential role in maintaining life-support systems and quality of life.

Detailed explanation-5: -Many key ecosystem services provided by biodiversity, such as nutrient cycling, carbon sequestration, pest regulation and pollination, sustain agricultural productivity.