B.
Deforestation affects ecosystems on land. there are no forests underwater
Natural indicators are important because they relate information about the acidity or alkalinity of a substance by demonstrating a shift in color which inform the observer about the pH level of the concerned material.
Natural indicators possess useful chemicals which relate information about pH level and because of this they are used in manufacturing of chemical indicators.<span />
Answer:
B
Explanation:
After 500 years the river will erode the mender neck to shorten its course
The layers are old and have cracks in it.