HELP ME PLEASE One group of students made a local watershed model. The watershed model was most likely used by the students to

demonstrate surface water collection at different locations
forecast floods and droughts at the location
investigate the amount of rain water used at the location
forecast the amount of precipitation falling at the location

Which statement best describes resistance? resistance is a. how well a current will flow in a material and is measured in volts. b. how well a material conducts an electrical charge and is measured in ohms. c. the ability of a material to attract a positive charge to create a current. d. the ability of a material to repel neutral charges and is measured in ohms.

Which best represents the law of conservation of mass ?

Ihave a density of 1.61g/cm^3 and a mass of 28g. find the missing value