Question

1. the amazon rainforest is the ideal place for uncontacted tribes to thrive because...

a. it is massive.
b. it is dense.
c. both of these
d. neither of these

Explanation:

The Amazon Rainforest's massive size and dense vegetation (making it hard for outsiders to access) both contribute to it being ideal for uncontacted tribes. So "both of these" (option c) is correct as both "massive" (a) and "dense" (b) are reasons.

Answer:

c. both of these