Some flowering plants have a long pistil that reaches way above the lower petals. what’s the purpose of this structure?
to spread pollen to another flower
to catch pollen as it spreads through the wind
to protect the developing plant embryos
to provide food for the developing plant embryos

to catch pollen as it spreads through the wind

Explanation:

Flowering plants use various pollinating agents to ensure pollination. Wind-pollinated flowers release their pollen in the wind which in turn carry them to the stigma of the same flower or of different flower present on the same or different tree. Wind-pollinated flowers have long style and large stigma to ensure the landing of wind carried pollen on the stigma.

the answer is; comparing the frequency of collisions with and without the device

this makes the anti-collision system an independent variable and the collisions a dependent variable. if there are fewer collisions with an anti-collision system that without, then it can be stated that the system is a success. essentially, collisions under an anti-collision system are compared with the frequency of collisions by cars with the human drivers.

affects the water bodies: excessive use of fertilizers causes eutrophication. the fertilizers which are used on plants affect the quality of land on which it is used, further causing erosion of soil. the fertilizers used on plants contain harmful chemical fumes which affect the environment.