Living organisms in our world are connected to other (11) ___________________________ in a variety of ways. The branch of biology called (12) ___________________________ is the scientific study of interactions among organisms and their (13) __________________________, including relationships between living and (14) ___________________________ things. All living things on Earth can be found in the (15) __________________________, the portion of Earth that supports life. It extends from high in the (16) ___________________________ to the bottom of the oceans. Many different environments can be found in the biosphere. All living organisms found in an environment are called (17) ___________________________ . Nonliving parts of an environment are called (18) __________________________. For example, whales, trees, and (19) _______________________ are biotic factors. Ocean currents, temperature, and (20) _________________________ are abiotic factors.