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Homeostasis and thermoregulation
When temperatures are too low, these processes may be disrupted, which can lead to cellular damage and even death. Homoeothermic endotherms, such as bears, bats, and birds, regulate their body temperature by generating heat internally.
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Answer:
The Marburg virus wasn't mutating this early on, therefore the Coronavirus is much more deadlier and almost impossible to get a cure for, due to the rapid change in pathogens!
They've constructed these proteins from beta-amino acids, which are distinct from the alpha-amino acids that compose natural proteins. Their synthetic proteins are as stable as natural ones, but provide a distinct advantage.
The Sun provides energy for the plants (producers) to grow. Herbivores (primary consumers) then eat the producers for energy. Any animals that eat the herbivores are considered secondary consumers. As this cycle continues, energy is lost to the environment as heat.