seed dispersal has a positive impact on a plant / a plant 's reproduction & if something has a positive impact on something else then that something helps that something else ->  seed dispersal helps a plant reproduce  seed dispersal helps a plant reproduce & a tree is a kind of plant ->  seed dispersal helps a tree reproduce  seed dispersal is when the seeds of a plant are moved / are carried / are spread / are dropped / from the parent plant to another area / new environment & when an animal gathers seeds it carries those seeds to a new area ->  an example of seed dispersal is is an animal hiding / gathering / burying seeds  nuts are a kind of fruit & fruit contains seeds ->  nuts contain seeds  an example of seed dispersal is is an animal hiding / gathering / burying seeds & nuts contain seeds ->  an example of seed dispersal is an animal gathering nuts  an example of seed dispersal is an animal gathering nuts & squirrels gather nuts & a squirrel is a kind of animal ->  an example of seed dispersal is a squirrel gathering nuts  seed dispersal helps a tree reproduce & an example of seed dispersal is a squirrel gathering nuts -> a squirrel gathering nuts helps a tree reproduce