Explain why mutation and natural selection make development of new flu vaccines necessary every year

Heat from earths interior and pressure from overlying rock transform the remains of marine sediments into

State officials are considering constructing a road through a forested wilderness area. this action will likely affect the forest ecosystem in various ways. part a: predict how the construction of a road could negatively affect plants and animals in that ecosystem. (3 points) part b: describe one way that the construction of a road could have a positive impact of the forest ecosystem. (1 point)

How can you tell the difference between rough er from smooth er?