What is tissue rejection, and why does it occur?

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Tissue rejection

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any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.

1. the energy lost to disorder metabolism     -entropy

2. related to or possessing motion potential     -kinetic

3. all of the chemical reactions in an organism required for maintenance of the processes of life entropy     -metabolism

4. possible; ability to go into action or perform work kinetic     -potential

5. the study of energy and its transformations thermodynamics     -thermodynamics