Answer: Mechanical weathering breaks rocks into smaller pieces without changing their composition and chemical weathering breaks down rocks by forming new minerals that are stable at the Earth's surface.
A virus is basically a shell of DNA. It floats around until it finds a cell to latch onto. It then tricks the cell into absorbing the virus and the virus unleashes the DNA its carrying telling the cell to quit doing its job, and make more of the virus. <span />
I would go with C most likely
