Which of the following are physical properties of a penny? choose all that are correct. select one or more:
a. conducts electricity very well.
b. resists corrosion from most acids.
c. reacts to oxygen when heated.
d. slightly red in color.

Which sentence best expresses the differing opinions of these two book reviews?

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

Ascientist is conducting an investigation that involves water, silver, carbon dioxide, and oxygen gas which group of statements best describes all of the materials he is using in the investigation?