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Dogs can regulate their body temperature by the time they are 7 weeks old.
Dogs have remarkable internal mechanisms that maintain their body at the proper temperature at all times, irrespective of the air temperature because they are unable to endure large changes in their body temperatures.
Dogs do not perspire through the skin as people do due to their insulating coats.
A comfortable winter temperature for most dogs is between 68 and 72 degrees. The same considerations mentioned above for selecting a safe, comfortable summer temperature setting apply to selecting a winter thermostat setting.
Learn more about a dog's body temperature at
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Answer:
geographical isolation
Explanation:
Reproductive isolation is a process of evolution that ensures that members of different species are incapable of mating and when they do, such mating do not result into any offspring or leads to the production of invalid offspring.
There are two mechanisms of reproductive isolation:
- Pre-zygotic mechanisms prevents fertilization between two different species and these include habitat isolation, mating seasons, mechanical isolation, gamete isolation, geographical isolation and behavioral isolation.
- Post-zygotic isolation prevents the products of fertilization from becoming valid and this include hybrid inviability, hybrid sterility and hybrid breakdown.
<em>Geographical isolation involves the existence of geographical barriers between two populations such that there cannot be mating between the two. The two populations eventually evolve to become different species.</em>
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Generally, the sun observes a solar cycle of eleven years. In this cycle, there are fluctuations in the activity, such as the ejected levels of solar radiation, and in the appearance of the sun, such as changes in the amount and size of sun spots, solar flares and other phenomena that occur on the sun's surface.
These changes also affect phenomena on earth, especially the auroras.
