Which of the following is not true about the structure of an alveolus?

a. it has thick walls to trap gases that enter during the breathing
b. it has many capillaries running through its structure
c. it has high surface area allow lots of gas exchange
d. it has high concentration of oxygen and low concentration of carbon dioxide

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.

yes the answer is total mass in unchanged   : )