What color do acids turn litmus paper? pink

red

yellow

blue

Can someone me with questions 15 to 17 plz.

How does the principle of electromagnetism explain the interaction between earth’s magnetic field and the solar wind?

The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.