Premise:
"Did Mrs. Vandemeyer suspect her? "
Hypothesis: Did Mrs. Vandemeyer assume she was the culprit?

it is not possible to tell

Premise:
"Our world has what is for them a normal gravity, but because of our much higher gravitational potential, our atmosphere is too dense to support them comfortably over sustained periods."
Hypothesis: You world has the same type of gravity as them.

yes

Premise:
"It brings together finds from sites all across the island and from every era of Crete's long ancient history, shedding light on the everyday activities of its people."
Hypothesis: No one knows just exactly how far back Crete's long ancient history goes.
it is not possible to tell