Hardwood trees have a lot of bark.
(I hope this is good enough.)
I would go with B) Nerves in the finger detect stimuli and send the message to the brain.
The earth's surface features are constantly changing in a process known as weathering and erosion. Weathering would happen when rocks would break physically like frost shattering while erosion happens when sediments and rocks are moved from one place to another by agents like water, gravity, wind and ice. These two occurrences are the cause of the constant change of the Earth's surface.<span />
It’s called a slump
Hope this helps :)
