One of mercury's properties is that it is a liquid at room temperature. a. reactive b. physical c. chemical

B. physical

Explanation:

Physical properties can be define as the properties which can directly be measured and observed without undergoing the change in the composition of matter. Physical properties include: texture, appearance, color, odor, density, solubility, melting point, polarity,boiling point and many others.  

The mercury remains liquid at room temperature this indicates the physical property of mercury as the composition of the mercury remains the same but the form may change like liquid, solid, or in the form of gas.

i think i can answer even without the example. over time with environmental changes, sometimes a group of animals will adapt to better survive. take a moth for example. if the trees the moths use to camouflage themselves from predators, started to die or change colors themselves, the moths may, overtime of course, change color too. its just adapting to its surroundings. hope i was of any : )