Answer: I think it’s waves
Explanation: The energy in waves is constantly breaking rock into smaller and smaller pieces.
Biomes are typically defined<span> by their climate and dominant vegetation, including grassland, tundra, desert, tropical rainforest, and deciduous and coniferous forests.</span>
I do believe that it is C. crossing over :) I hope that is correct, it seems like the only plausible answer.
1- Mutation
2- Gene Flow
3- Sexual reproduction
Hope this helps :-)
