Question

1. Have organisms changed over time?

2. How do we know?
3. What constitutes evidence of that change or lack of change?
(I just need help on 3 I just put 1 and 2 there for people to better understand the question.)

Answer 1

1 yes they have
2 we can tell by looking at fossil
3 This can be shown by looking back only a couple of hundred years ago and seeing we have not changed our human form

Answer 2

By looking at the remains of the organism and older remains of the Same or similar organism we can compare them to find the differences like bone structure or leaf shape