How would we know what happened in the greenhouse classroom. This is clearly something you did at school and we don’t know.
Freshwater wetlands are like swamps plus ponds and lakes are smaller smaller than swamps.
It is a perfect example of a natural selection.
(I'm not sure if this is the exact answer that you are looking for.)
The answer is d. the ability to transmit light; for example, air
Transparency means allowing light to pass through the material. Thus, the transparent material must be able to transmit light. Air is transparent. It is a gas containing very few atoms, so light run into few of them and thereby air looks transparent.