Describe four ways in which natural processes add harmful particles in air

When analyzing tree rings, what do scientists assume a thin ring indicates?

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

Which phase of the cell cycle ensures that identical copies of the dna are made for daughter cells?