What type of variation is necessary for natural selection to occur artificial variation environmental variation genetic variation neutral variation

The buildup of sediments where a river empties into a slow-moving or nonmoving body of water is known as a/an

Which of the following is an example of competition that could be found in a forest? question 14 options: deer eat berries and their droppings seed new areas creating more berry bushes two fox populations utilize the same rabbit population as their main food source two hawk populations utilize the same scorpion population as their main food source lack of sunlight due to changes in the seasons restricts the growth of certain plants

Apopulation of black bears depends on salmon from a stream for food. if a drought causes the stream to run dry one year, how will this likely impact the black bear population?