Only the last one provides an actual evidence of having a common ancestor. The rest can be a result of living in a similar environments that makes life easier. For example, many species live next to water, as water provides more fertile ground for plants, and they might have similar behaviors (searching for water) but they might not be closely related.
so the correct answer is D.
That statement is true
Due to extreme amount of heat, the rain water that falls on the dessert will quickly be evaporated. To collect more of it, usually the roots of the dessert plants are really close to the surface
If the plants are close to each other, they simply won't be able to collect any water, so they spread evenly throughout the dessert
The answer would be: Endometrium.
