What have we learned from fossil evidence about evolution? Select one:
a. It is an abrupt change.
b. The process is observable.
c. It takes place during one lifetime only.
d. The most complex traits are always selected.

The process of evolution will need a long time to show a changes. It should not only a lifetime of the organism, but much longer. The long period cause the process hard to observe. The fossil will show that organism that getting a good trait will survive natural selection, while organism with bad trait will be eliminated.