What is one advantage a primary source has over a secondary source? a. a primary source always includes several perspectives. b. a primary source combines several different accounts of an event. c. a primary source offers a firsthand account of an event. d. a primary source generally benefits from having been written after an event.

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?

Beryl states that insulation with the smallest possible thermal conductivity is best to keep a house warm in winter, but worst for keeping a house cool in summer. sapphire insists the reverse is true: low thermal conductivity is good in the summer, but bad in the winter. which one, if either is correct? a. beryl, because low thermal conductivity results in low heat transfer. b. beryl, because low thermal conductivity results in high heat transfer. d. sapphire, because low thermal conductivity results in high heat transfer. e. neither, because low heat transfer is desirable both in summer and in winter.

Ascientist wants to test ways to reduce pollution in lake . what is the bestway of doing this