Question

The wind blew the dandelion seeds and scattered them so they could germinate in new locations.
a:environmental factors.
b:genetic factors
Bluebells grow best in shade. The tree that gave them shade has been cut down and now they are dying.
a:environmental factors.
b:genetic factors

Answer 1

1) a: environmental factors — wind dispersed the seeds, an environmental cause.
2) a: environmental factors — loss of shade (a change in the plants' environment) caused the bluebells to die.