What is the main function of the structure labeled A?

It attracts insects and other animals.
It moves the pollen to the ovaries.
It catches pollen.
It produces pollen.

About how many years does it take for one cycle of surface water to become deep water and then surface water again in the oceans? 101001,000

There are two tomato plantlets one of them is kept in an oxygen chamber with a light source and another is kept in sunlight. both of them are watered regularly what will be the observation after two weeks

Which characteristics describe a spiral galaxy?