bears, cats, orangutans and humans are all classified as

A non-native species introduced into an ecosystem is called an

Chemicals in the air and garbage in the oceans are examples of

this species of living things was born with gills to breathe underwater, but through change, developed lungs to breathe oxygen

organisms that break down dead or decaying organisms

What is one way that humans have a negative impact on biodiversity?

can be described as a tall, dense jungle; high amount of rainfall it gets per year; is very hot and humid so the animals and plants that exist there must learn to adapt to this climate

Habitat destruction will often result in the decline of a specific species. When population numbers for this species are very low, we call this

the variety of life in the world or in a particular habitat or ecosystem

behavioral or physical characteristics of an animal that help it to survive in its environment

shows how each living thing gets food, and how nutrients and energy are passed from creature to creature

covers about one-fifth of Earth's surface; can either be sandy, gravelly, or stony; extremely dry area of land with sparse vegetation

a collection of plants and animals that have common characteristics for the environment they exist in