Researchers returning from the world’s most ambitious study ever of the A. Mars
B. South Pole
C. North Pole

North Pole

Explanation: On Oct 12th, 2020 the largest expedition ever undertaken came to an end after researchers spent over a year studying climate change and ice drifting in the Arctic.

b.

ionic bonds are two oppositely charged ions that attract. a sodium ion has a 1 positive charge; a chloride ion has a 1 negative charge. sodium and chloride have oppostive charged ions that attract which forms an ionic bond. a chemical bond formed when two atoms share electrons is called