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.

Respuesta :

Answer:

it is C

Explanation:

just because it is

Answer:

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)