In a close terrarium, why does water vapour appear on the wall of the jar?​

This is due to the evaporation from the moisture coming from the plants.

The water vapor then condenses on the walls of the terrarium and ultimately falls back to the plants and soil below.

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands