The 'web of life' is a metaphor used to represent the complex network of interactions and dependencies between organisms in an ecosystem.

The atmosphere is not a component of an ecosystem, but rather the surrounding environment in which an ecosystem exists.

Producers, such as plants, use sunlight through photosynthesis to convert carbon dioxide and water into energy-rich compounds.

Apex predators are at the top of the food chain and have no natural predators.

Decomposition is the process by which decomposers, such as fungi and bacteria, break down organic matter into simpler substances.

Mutualism is a symbiotic relationship where both organisms benefit from the interaction.

Natural selection is the process by which organisms with traits that are better suited to their environment are more likely to survive and reproduce.

Interspecies competition is not a factor that affects the stability of an ecosystem, but rather a natural phenomenon that occurs between different species.

Energy flow refers to the transfer of energy from one organism to another through the food chain.

Sea otters are an example of a keystone species because their presence has a significant impact on the structure and function of the entire ecosystem.

Excretion is the process by which organisms release waste products, such as carbon dioxide and urea, into the environment.

Interspecies competition is not a limiting factor, but rather a natural phenomenon that occurs between different species.

Adaptation refers to the process by which organisms develop traits that help them survive and reproduce in their environment.

Ocean is not a type of ecosystem, but rather a vast body of saltwater that covers a large portion of the Earth's surface.

Ecology is the study of the interactions between organisms and their environment.