Which is a nonliving factor that defines a spruce-fir forest ecosystem?
A) type of soil
B) type of trees
C) type of bacteria
D) type of mammals

Asample of aluminum foil contains 8.60 × 1023 atoms. what is the mass of the foil?

Which is a chemical property of iron? a. it forms iron oxide (rust) when exposed to moisture and air. b. it is a gray–black metal that is hard to the touch. c. it has a melting point of 2795°f (1536°c). d. it is a good conductor of heat

Suppose you have designed a new thermometer called the x thermometer. on the x scale the boiling point of water is 129 ? x and the freezing point of water is 13 ? x. part a at what temperature are the readings on the fahrenheit and x thermometers the same?