Which of the following is an example of a species changing over time?

select all that apply.

a.
a gardener notices a new kind of squash growing after he only planted seeds from his previous squash plants.

b.
a rabbit’s ears are bigger than a mouse’s ears.

c.
some weeds have become resistant to a chemical designed to kill them.

d.
the purple-spotted butterflies in your collection have more spots than the purple-spotted butterflies your grandfather collected when he was a child.

e.
a giraffe's neck is longer than a deer's neck.