Which of the following best explains the decrease in nitrogen compounds in the first
plot?
A.
The nitrogen compounds had broken
down into elements.
B.
The nitrogen compounds were absorbed
by the seedlings for their growth.
C. The nitrogen compounds escaped through
air pockets created by the seedlings'
roots.
D. The nitrogen compounds had evaporated
because of the warm summer
temperatures.

Holozoic nutrition refers to the regular animal nutrition mode whereas saprophytic nutrition refers to the nutrition mode of fungi and bacteria.

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.

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