For natural selection to occur, several premises must be satisfied. Firstly, there must be variation in a population. If all individuals are the same, there is no variation on which selection can occur. Secondly, these traits must be heritable, meaning they are passed from parent to offspring. Natural selection cannot operate on traits that have no genetic basis. There must also be differential reproduction, which means that some individuals must reproduce more than others. When all of these factors occur, natural selection results in evolution as advantageous traits propagate throughout the population.
Natural selection is quite variable, as changes in the environment impact what traits are advantageous in a particular time and place. A good of example of this comes from Galapagos finches. These birds have varying beak sizes. Wide beaks are best for eating hard seeds, while long narrow beaks are more adept at exploiting the fleshy fruit from trees. Typically narrow beaks are more prevalent, but during drought conditions when trees cannot produce fruit, seeds become a more abundant food item. This results in those finches with wide beaks having more food available and reproducing more than those with narrow beaks. When droughts persist over many years, wide beaks replace narrow beaks as the most common, but this trend reverses when droughts end and fruits once again become available.
Answer:
Weather observations become climate data when weather conditions are measured at thousands of locations every day for 30 or more years.
Explanation:
According to the definition of climate, observations of the weather conditions are required for a very long period of time, even 30 years or more, registered in many places.
Weather refers to the presence of certain characteristics such as air pressure, temperature, humidity or wind speed in a given place in short periods, such as 24 hours.
Meteorologists refer to the climate taking into account the information collected from characteristics, such as temperature, air pressure or rain, in many places and for long periods of time, establishing an average value and with the possibility that this helps to predict weather behavior.
All weather information collected around the world over a period of 30 years or more becomes average values of temperature, air pressure, humidity, speed and wind direction that serve as climate data to predict the behavior of the weather in a determined place.
Learn more:
Meteorology and wheater brainly.com/question/5032766
obesity it's self often causes irregular cycles so the woman could have no knowledge of the pregnancy for a longer time because this lack of period would be expected. weight gain could also go unnoticed.
