Give some examples of a situation when a substance cannot be moved into a cell by osmosis or diffusion, and how active transport solves the problem. please help me

Where can a dna be found in a prokaryotic cell

Ture or false evidence for evolution includes millions of fossils

Based on the observation that only male crickets produce a song, you hypothesize that a male's song is a form of communication to potential mates. you set up a simple experiment to test this hypothesis. in the laboratory, you place a male snowy tree cricket in enclosure a, which is adjacent to enclosureb. in enclosure b, you place other insects, one at a time, and observe their responses to the male's song. the enclosures are designed so that the two insects being tested cannot see or smell each other, but sound is transmitted from enclosure a to enclosureb.