4. Students are studying how the positions of Earth and the Sun effect changes on Earth. After four seasons have passed on Earth, which has happened?
a. Earth has completed one rotation around the Moon
b. Earth has completed one revolution around the Sun.
C. The sun has completed one revolution around the Earth
d. The moon has completed one revolution around Farth

Time remaining 58: 10 an atom that has 84 protons and 86 neutrons undergoes a reaction. at the end of the reaction, it has 82 protons and 84 neutrons. what happened to the atom? it accepted radiation in a chemical reaction it donated neutrons to another atom in a chemical reaction it emitted an alpha particle in a nuclear reaction. it accepted protons in a nuclear reaction. mark this and retum save and exit next submit