The season that is starting is winter.
The answer to 21 is (4)
Isotones are nuclides that have the same neutron number but a different proton number. Therefore the answer is C. boron and carbon.
Planck suggested that light/energy was absorbed/released in certain amounts, called quanta.
0.7 my teacher just gave me the answer i got too lazy to explain why
Answer:
The molecules in liquids flow, and are able to move more than those in solids