Which of the following most likely happens when astronauts go to space? - Their heart rate speeds up because the blood vessels have less blood to circulate .
- Their heart rate speeds up because the blood vessels have more blood to circulate .
- The blood vessels in their neck caves in because the heart pumps less blood per beat.
- The blood vessels in their neck bulges out because the heart pumps more blood per beat.

The image shows a sandstone formation with visible bands of different colors. what do the bands indicate about how this sedimentary rock was formed? choose two answers. a). the rock was made from more than one material. b). water was absent during the compaction and cementation process. c). sediments and other matter were deposited in layers before lithification. d). the rock was stretched horizontally by the pressure from surrounding rocks. e). layers of hot liquid in the rocks cooled and solidified at different tempatures