C. Skates that have three wheels with a pick
Although sleep requirements vary from person to person , most teens are recommended to get 8 hours of sleep per night.
Answer:
not sure if this helps but. Concept development is a set of activities that are carried out early in the systems engineering life cycle to collect and prioritize operational needs and challenges, develop alternative concepts to meet the needs, and select a preferred one as the basis for subsequent system or capability development
