Premise:
"His shout was drowned in the roar of the motor."
Hypothesis: His words were incomprehensible because of the engine.

yes

Premise:
"Generally speaking, there are three routes to equal access for those who cannot afford legal the public defender's office (for criminal- cases); legal services (federally funded); and the local bar associations that coordinate pro bono work."
Hypothesis: There are multiple options for those who cannot afford legal services.

yes

Premise:
"The tidal estuary harbors a number of islands that serve as important breeding grounds for seabirds."
Hypothesis: Important breeding grounds for seabirds can be found in the islands within the tidal estuary.
yes