During the evening, cold air from mountaintops rushes into the valleys below. Why does this occur? O A. Cold air is less dense than warm air, causing the cold air to sink. B. Global wind patterns cause this wind movement at night. O C. Cold air is denser than warm air, causing the cold air to sink. D. As clouds develop on the mountaintops, precipitation causes wind movement.​

1. true.2. true.3. true.4. false.5. true.the concept of darwin's theory of evolution involves the idea that there are limited resources in a given living environment and that the organisms which live within have variations in their genetic make up due to random mating. the ones with beneficial genetic variations can express certain traits which give them an upper hand in surviving and reproducing in the said environment compared to ones who may have a more disadvantageous variation in traits. over time, the organisms with an upper hand will survive and reproduce more frequently and pass on their beneficial genes while the others die. the result is evolution, where we observe (usually, but not always) eventually, phenotypic distinct changes.