pick from the following.
1). alveoli.
2). an anion.
3). tortoises.
4). tail fins.
5). engines.
6). rivers.
7). Inches.
8). vehicles.
Q: Fact 1: Rivers are usually larger than streams. Fact 2: Second half becomes rocky with small stream crossings some standing water. Given the two facts above, what are usually larger than small water crossings?
A:
6).