List the letters: Compare and contrast:
Non-native species:
Invasive species:
A: not indigenous
B: harmful to indigenous species
C: not harmful to indigenous species
D: Can cause species to go extinct
Comparison: Both non-native and invasive species are not indigenous to the area.
Contrast: Invasive species are harmful to indigenous species and can cause them to go extinct, while non-native species may not necessarily have a negative impact on the indigenous species.