The two sounds heard through the stethoscope during a heartbeat are known as lub and dub. If the doctor detects an unusual lub sound, evaluate which description could explain the atypical sound.
A)
The aorta extends during the systolic phase.
B)
The mitral valve does not close after the systolic phase.
The aortic valve does not close during the diastolic phase.
D
The pulmonic valve does not close during the diastolic phase.

Asolution of an enzyme and a substrate was placed in a water bath and the temperature of the reaction was raised gradually. the graph shown was plotted at the end of the experiment. what can be concluded from the graph? a) temperature has no effect on the activity of the enzyme. b) the effect of temperature on the enzyme is unpredictable. c) the enzyme shows increased activity up to a certain temperature. d) the activity of the enzyme is inversely proportional to the temperature.

Ascientist is examinin the cell is disrupted when she damages one specific type of macromolecule g the function of macromolecules in a cell she notices that movenent of large molecules into and out of

What does the number 18.9984 represent in the image?