D. get going
the sentence is in the past
Carl explained to Mark that he had some work to do and had to go.
Answer: 1. Positive integers less than 10
2. Prime numbers U
3. Numbers in U that are prime or even
4. Even prime numbers in U
Explanation:
A three-dimensional space where an electron spends most of its time with no more than 1 other electron, forming a pair
