Answer: Part A: D They separated into different groups long ago.
Part B: The answer is: "it also seems like they didn't mix much with outside groups until the arrival of Europeans in the seventh century"
Explanation: I took the test hope this helps!
- To temporarily manage the size of the plant. - To define garden spaces (hedges). - To create special effects such as topiary or espalier. - To reveal colorful or decorative bark or enhance winter silhouette