Question

question 42
the amazon rainforest
is part of the biosphere
contains one biosphere
is an example of a biosphere
contains multiple biospheres

Explanation:

The biosphere is the global sum of all ecosystems. The Amazon rainforest is an ecosystem (a large one) and thus is part of the biosphere. There is only one biosphere on Earth (it's the sum of all life - containing parts of Earth). So, the Amazon rainforest cannot contain a biosphere or be an example of a biosphere (since the biosphere is the entire global sum), and it also cannot contain multiple biospheres as there is only one biosphere.

Answer:

is part of the biosphere