The cardiovascular system works closely with the __ system, which takes oxygen out of the air and makes it available for our cells to use. a. endocrine b. excretory c. digestive d. respiratory

Janelle made a hypothesis bout the uneven temperatures inside her house during winter. she believes that 50% of the ducts are blocked and she plans to investigate. if she wants to prove her hypothesis using scientific processes what should she do next?

Two technicians are discussing a resistance measurement between the can-h and can-l wires. technician a says this measurement should be done with the ignition switch in the "run" position. technician b states that a measurement of 0 ohms indicates an open in the network. which technician is correct?

Rohit is trying to tune an instrument