When is a door not really a door?

Luminous objects such as flashlights emit light that we can see. how do we see an object that isn’t luminous? a. the object emits light that reaches our eyes. b. light reflects off the object and reaches our eyes. c. light passes through the object uninterrupted. d. light is fully absorbed by the object. e. we can’t see an object that isn’t luminous.

How do we determine if they are made with matter

Aggregation is the process of all of your data. a. gathering b. analyzing c. collecting d. observing