Hello,

evolution of human is a long process.

Chimpanzees are considered as closest ancestors of humans.

The modern human is considered to have closest similarity with the species homosapien.

During ice age between 75,000-10,000 years ago modern Homo sapiens arose.

Hope you find this information helpful.

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Thermoregulation is energetically expensive for many organisms,specially for small animals like birds,shrews.we know that heat gain or heat loss is the function of surface area.Since these small animals have larger surface as compares to there volume they lose body heat very fast during  exposure to cold environment.To maintain their metabolism they have to expend much energy to keep their body warmer that much energy a small creature could not afford and thus they simply conform.

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Knowing the evolutionary relationships among species allows scientists to choose appropriate organisms for the study of diseases, such as HIV. Scientists are even using the principles of natural selection to identify new drugs for detecting and treating diseases such as cancer.