Which is an example of entrepreneurship?

a. tre volunteers at a local nursing home that is in need of .

b. peter got a job at a mechanic's shop repairing cars and trucks.

c. sarah does her chores every day in order to earn her allowance.

d. jemele uses her money to open a restaurant in her neighborhood.

Ascientist performs an experiment where she measures the mass of a piece of metal, pours acid onto the metal, washes the metal, and then re-measures the mass of the metal. the scientist repeats the experiment several times, each time increasing the amount of acid used. the dependent variable in the experiment is the: initial mass of the metal final mass of the metal amount of acid used washing the metal

What type of monarch was fredrick the great ?

What river systems the worlds earliest known civilization develop ?