4 | A: One species, Box-elder, has naturally compound leaves that usually has a simple three or may have five, seven, or rarely nine leaflets. |
B: One species, Box-elder, has internally compressed leaves that may be simply trifoliate or may have five, seven, or rarely nine leaflets. |
8 | A: Though individually small, the appearance of an entire tree in flower can be beautiful. |
B: Though each one is small, the effect of an entire flowering tree can really stand out. |
9 | A: They are shaped to spin as they fall, carry the seeds a considerable distance by wind. |
B: They carry the seeds a short way by wind as they are shaped to rotate and rise. |
10 | A: However, hundreds of thousands of trees release seeds all the time. |
B: However, hundreds of thousands of times, one tree releases seeds. |