Identify each of the following equations as which type of chemical reaction? c12 + nal —- nacl + 12

The grooves or folds of the brain are called

Great amounts of electromagnetic energy from our sun and other bodies in space travel through space. which is a logical conclusion about these electromagnetic waves? their energy must be very their frequency must be very low these waves can travel without a medium they only travel through a vacuum of space

Can someone me with 3 and 4 plz. this is for masteries test.