Which of the following traits is acquired

The softest and hardest minerals are: softest hardest

Acaterpillar tries to climb straight up a wall a meter high, but for every 2 cm up it climbs, it slides down 1 cm. eventually, it reaches the top. when it reaches the top, it does not pull itself over so it will slide down 1 cm. what is the total displacement traveled?

In an experiment, how can i change human errors? be specific.