The cloud of interstellar dust and gas that forms a star is known as a
a. white dwarf.
b. protostar.
c. red giant.
d. nebula.

State one advantage and one disadvantage of using a plane mirrior as a driving mirrior

Hen a gfci receptacle device is installed on a 20-ampere branch circuit (12 awg copper), what is the minimum volume allowance (in cubic inches) required for conductor fill for each conductor in the outlet box?

When can a theory be modified if a new type of technology allows for new observations that raise new questions? a-immediately, while the questions about the theory are being asked b-after new hypotheses related to the theory are tested in experiments c-only after the new observations disprove all parts of the theory d-while scientists begin to think about how the theory could improve