Question on picture ，pls help

a. to find the volume of a shape using V=I Xw X h. Pull out your LEGO bricks and begin with a 1 by 1.

b.Direct measurement is measurement done by bringing the target into contact with the measurement system to read the length, height, or other aspect directly. Although direct measurement allows measurement results to be known as they are, errors may occur depending on the skill of the person doing the measurement.

c.1. Switch off the fan in the lab so that wind will not affect the result. 2. Ensure that the ruler has stopped moving before taking length measurement.

the answer for apex is the lowest

d) physical means can be used to separate the components of air.