Fact 1: Arteries generally carry oxygen-rich blood. Fact 2: Energy levels can plummet due to lack of oxygen-rich red blood cells. Given the two facts above, _ are needed to maintain energy levels ?
Options are:
[1]. Ligaments
[2]. follicles
[3]. hydration
[4]. environment
[5]. glucose
[6]. pores
[7]. exercise
[8]. Arteries
Answer:
[8].