The answer is B., Natural Selection.
Weather certainly doesn't change populations, and genes only caused individuals in a population to be slightly ( genetically-wise ) different from the others. It does cause change, but not change in the whole population over time.
Natural disasters don't change the populations over time either. Natural disasters only caused change in their environment, at most.
So, the only answer left is natural selection, and it makes sense too!
Natural selection is the process where the individuals with better traits suited to survive in that specific environment live on and give those good traits to their offspring.
The individuals with less suited traits to survive will die out, and will not be given an opportunity to reproduce and pass on their less suited traits, so over time, the population will increase of individuals with better suited traits to survive and the individuals with less suited traits will eventually die out, therefore making the entire population change.
Hope I helped you!
In animals, the circulatory system performs a similar function because it transports vital nutrients around the body of the animal, just like how xylem and phloem transport water, minerals, and sugar to different parts of the plant.
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According to Charles Darwin's theory of natural selection, only those individual are able to survive that adapt better to the changing environment and are able to reproduce. Whereas according to Lamarck, the characters that an individual gains during its lifetime are passed on to its further generations.
Natural selection is the phenomenon that states that only those individuals area able to survive in the environment that adapt better to the changing surroundings and are successfully able to reproduce. The theory was out forward by Charles Darwin.
Characters are the traits that may be phenotypically visible or present at the genetic level. These characters define an individual.
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