Loss of lung tissue elasticity is characteristic of

Emphysema

Explanation:

Emphysema is characterized by the loss of lung tissue elasticity. Normally, lungs are like sponges, they are springy and with small holes. But people with emphysema have tissue damage in the lungs, and the holes are a lot bigger, which affects the elasticity of the lung tissue. Because of the big spaces in between, instead of expelling air, a lot gets trapped in the lungs because it cannot push it out. That's why people with emphysema have shortness of breath because they cannot exhale properly.

-using seeds from the same source

-using the same kind of soil for both groups

-giving the control and experimental groups the same volume of water

-keeping the light the same for the experimental and control groups

-measuring plant height the same way and at the same time for both groups

Explanation:

Using seeds from the same source makes sure that the seeds are of the same species, and using the same soil prevents one group from growing faster or slower because of increased initial nutrition. The same amount of water was also used so that the plants wouldn't die or grow more quickly solely because of water. And, finally, accurate measurements were taken to minimize the chance of incorrect information.