Which of the following best describes the difference between a mixture and a pure substance? A. A mixture is made up of more than one type of atom; a pure substance is made up of only one type of atom.
B. A mixture is made up of only one type of atom; a pure substance is made up of more than one type of atom.
C. A mixture has different properties throughout; a pure substance has the same properties throughout.
D. A mixture has the same properties throughout; a pure substance has the different properties throughout.

Kelly ran electricity though a sample of water using electrolysis. the water changed into two gases, x and y. it was not possible to break down the gases x and y into simpler particles.

Hydrilla (hydrilla verticillata) is an invasive aquatic plant and one of the most serious aquatic pests in florida. hydrilla has already been introduced to hundreds of bodies of water throughout florida, hydrilla is difficult to control because it grows rapidly and survives in many different water depths and conditions. hydrilla • describe how hydrilla affects native plant and animal species. include both a biotic and an abiotic limiting factor. • suggest one biotic and one abiotic recommendation that could slow the spread of hydrilla

Which type of respiration takes place when there is no oxygen present? a. anaerobic b. mitochondrial c. cellular d. aerobica. anaerobic