Final answer:
The given sequence -2, 0, 2, 4, 6, ... is an arithmetic sequence with a constant difference of 2.
Step-by-step explanation:
The given sequence -2, 0, 2, 4, 6, ... is an arithmetic sequence. In an arithmetic sequence, each term is obtained by adding a constant difference to the previous term. In this case, the constant difference is 2, so we keep adding 2 to get the next term.