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.

B. The Process Is Observable

Explanation:

You can observe all fossils from a billion years ago to now and there will be a change you can see visually.

a. as the temperature increases, the kinetic energy of the gas molecules increases & the molecules move faster & further away from each other.

b. if you decrease the temperature of a fixed amount of gas at constant pressure, the combined gas law reduces to charles's law. in this case, volume will also decrease.