5. Why does having low levels of glucose or oxygen in his cells make it difficult for David to walk up steps? Which body systems should the doctor test in order to find out whether David's
cells are getting enough oxygen and glucose and why?
I need help ASAP

For waves in the ocean, the medium of the waves is a. air b. water c. energy d. a passing boat

Is a volume of space that is empty of matter.

Six pendulums of mass mand length las shown are released from rest at the same angle theta from vertical. rank the pendulums according to the numberof complete cycles of motion each pendulum goes through perminute. a. l= 1m m=2kg b. l= 4m m=1 kg c. l= 2 m m= 2 kg d. l= 1 m m= 4 kg e. l= 2 m m = 4 kg f. l= 4m m = 4kg