The interdependence of body systems is essential because
a. very few processes are controlled by hormones.
b. all systems work together to maintain homeostasis.
c. each system doesn't rely on the others to work.
d. each system can work independently on its own.

they each offer a fresh glut of resources to the organisms that can arrive and exploit them. as individuals and new species continue to appear, they actively and passively alter the environment. competition for shared resources increases, local abiotic and biotic conditions shift, and the relative abundances of species change accordingly. the process is called ecological succession, and it is one of the earliest and most well-known concepts in ecology.

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