Option. B) As the pH decreases, the number of surviving species decreases.
Explanation:
Marine animals is greatly affected by the pH of water. If the pH of the water decreases, the marine animals could not survive and die due to acidification of water. Marine animals grow well in optimum pH of the water. If the water is alkaline i. e. having high pH, the marine animals are adversely affected and decrease occurs in the population of fishes and other marine animals.
According to the principle of superposition the youngest rock formed lies at the upper layer and the oldest rock are found at the lowest of all the layers. The principle of superposition states that the layer of rock that is formed first lies at the bottom and the layer that is formed upper after that lies at the upper and is the newest layer of rock.
