Nitrogen is released to the abiotic parts of the of the biosphere from the processes of death and ____.

Carbon dioxide in the atmosphere enters the biotic parts of the biosphere through _____.

cougars are predators that often eat weakened or diseased animals. this is a description of the ___ of cougars.

An ecologist who studies how several species in an area interact with one another and with the abiotic parts of the environment is interested in the biological organization level called a(n) _____.

Parasitism, mutualism, and commensalism are examples of _______.

Both the alga and the fungus are benefited from their relationship in a lichen. This relationship is one of ______.

Before plants can reuse many organic materials, the materials must be broken down by _______.

study of how living things relate to each other and their environment

relationship between organisms in which both organisms benefit

network of interconnected food chains

relationship between organism in which one organism benefits and the other is neither harmed or benefited

simple model for showing how matter and energy move through an ecosystem

place where an organism spends its life

manufactures food using energy from the sun or from chemical compounds

relationship between organisms in which one organism benefits at the expense of the other

step in the passage of energy and matter through an ecosystem

obtains energy and nutrients from autotrophs

breaks down dead organisms

An uncut lawn eventually becomes a meadow and then a forest. This process is an example of ______.

The stable ecosystem that develops due to succession is called ____.