# BIOL 461 Final Exam

T or F: an organism's upper thermal limit is determined by the temperature at which their proteins denature
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The Gaia hypothesis states that the Earth and its inhabitants work together in a symbiotic relationship to keep each other alive. The biota of Earth affect its "health" as does Earth affect its constituents' health. The idea is that each are living beings with an important role in each other's wellbeing.
1. Coevolutionary Gaia: states that the biota and the earth coevolve and that their actions have negative and positive feedback loops that set the stage for coevolutionary change.
2. Homeostatic Gaia: states that interactions between the biota and the physical environment serve to maintain homeostasis, specifically in terms of climate.
3. Optimizing Gaia: states that biotic control of the physical environment creates optimal conditions for the biosphere.