An ecosystem is made up of the biotic (living) community and the abiotic (nonliving) factors that affect it. The health of an ecosystem is directly related to water quality (6.8 a).
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To survive, plants require light and water for photosynthesis. Plants have developed responses, called tropisms, to help ensure they grow toward adequate sources of light and water (i.e., phototropism and geotropism) (LS.8 a).
Organisms may exist as members of a population; populations interact and are interdependent with other populations in a community (LS.6 a).
The interaction between a consumer that captures and consumes another consumer is the predator-prey relationship (LS.6 a).
A circadian rhythm is a roughly 24-hour cycle in the physiological processes of living things, including plants, animals, fungi, and cyanobacteria. This cycle aids life processes (LS.8 a).
Factors can positively and negatively affect the cycles of matter and the life processes of living things within an ecosystem. Disruptions to any component of an ecosystem can lead to shifts in the size and/or distribution of its populations (LS.8 b).