Why do seed plants need to evolve ways for dispersing this seed?

Plants make seeds that can grow into new plants, but if the seeds just fall to the ground under the parent plant, they might not get enough sun, water or nutrients from the soil. Because plants cannot walk around and take their seeds to other places, they have developed other methods to disperse (move) their seeds.

all matter is made up of atoms

in any element all atoms are the same

elements in a compound are always in a constant ratio: apex

thats not even an aswer choice