Q: The simplest system is that of contractile vacuoles present in what? Choices: - parasites - macroorganisms - crystals - microorganisms A:
microorganisms

Q: Plant cells have cell walls that are made of what? Choices: - carbonate - nucleus - tissue - cellulose A:
cellulose

Q: Which kingdom are mosses and trees included in? Choices: - protista - fungus - gymnosperm - plant A:
plant

Q: What continuously monitors and repairs its genetic material? Choices: - ova - nucleolus - proteins - cells A:
cells