What is a substance that provides the host immunity by introducing a weakened (attenuated ) or killed (inactive ) version of a virus?

-bleach
-lytic virus
-antiviral drug
-vaccine

Because some people pollute water ans waste it

It's either -limiting factors or -scarce resources but i'd go with my first answer since the food and water are abundant they really aren't scarce

By water evaporation from the leaves is created a negative pressure at the top of the tree that promotes the ascension  of the water through channels that are called xylem. there are also two molecule forces that are involved: the intra-water molecules cohesion (water molecules stick to each other) and the adhesion when the water molecules stick to the channels they are running in. this is what enables water to go from the roots to the top of a tall tree.