4b. identify a specific human action or natural change to an ecosystem and explain how it could result in…

Brief Explanations:

One human - action is deforestation. When forests are cut down for agriculture, logging, or urbanization, many species lose their habitats. This directly reduces the number of species in an ecosystem as plants and animals that depend on the forest environment may die or be forced to migrate. If they cannot adapt or find a new suitable habitat, they may go extinct, thus decreasing biodiversity. A natural change could be a volcanic eruption. The lava and ash can destroy large areas of habitat, killing plants and animals directly. The long - term changes to the soil composition and climate in the affected area can also make it difficult for many species to survive, leading to a decrease in biodiversity.

Answer:

Human action: Deforestation. It destroys habitats, causing species loss. Natural change: Volcanic eruption. It destroys habitats and alters environmental conditions, reducing biodiversity.