Q: Bronchial tubes in the lungs branch into ever-smaller structures, finally ending in alveoli. the alveoli act like what? Choices: - filters - springs - bellows - tiny bubbles A:
tiny bubbles

Q: What is a double membrane of the nucleus that encloses the genetic material? Choices: - the complex envelope - the cell wall - the nuclear compression - the nuclear envelope A:
the nuclear envelope

Q: What element do plants use to store energy as atp? Choices: - nitrogen - chlorophyll - carbon - oxygen A:
oxygen