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Discuss the two forms of planned economies and give examples of each.
Prezygotic Barriers
Reproductive isolating mechanisms that occur before the fertilization of the egg, such as geographical, temporal, or behavioral differences that prevent species from mating.
Ecological Barriers
Physical, chemical, or biological factors in the environment that prevent species from dispersing to certain areas, limiting their distribution.
Biological Barriers
Structures and mechanisms that protect organisms from pathogens, toxins, and other external threats.
Energetic Barriers
The energy obstacles that must be overcome for a chemical reaction to proceed, related to the activation energy of the reaction.
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