Pioneers who crossed the Sierra Nevada mountains in the mid-1800s were threatened by exposure to too much sun.
Apache and Comanche attacks.
snow and freezing temperatures.
slow travel across sand.

c is correct!

Explanation:

if ur on the quiz

1. A

2. B

3. C

4. A

5. A

6. C

7. D

8. C

9. C

10. A

hope this helps! (i got a 100 lol)

evelyn king wrote that song called love come down

explanation:

the foundation of greek city-states: following the fall of the mycenaean civilization in the 10th century bc, the area surrounding the empire went through its own mini dark ages. answer and explanation