(Question)
Q: What part of the cell controls what enters and leaves? Choices: - nucleus - protein - organism - membrane A:
(Answer)
membrane

(Question)
Q: What do the muscles of the gastrointestinal tract do? Choices: - break down food - secrete stomach acid - stop digestion - keep food moving A:
(Answer)
keep food moving

(Question)
Q: What kind of solids are generally classified by the forces that hold their particles together and include ionic, metallic, covalent network, and molecular types? Choices: - distinct solids - helium solids - flat solids - crystalline solids A:
(Answer)
crystalline solids