Which statement about the redwall limestone layer is true? a. it is younger than supai group and hermit shale. b. it is older than muav limestone but younger than bright angel shale. c. it is older than muav limestone and bright angel shale. d. it is older than supai group but younger than muav limestone.

The image below shows a common blood pressure gauge. what does this device do? a. measures the level of oxygen present in the blood b. measures the pressure of blood when the lungs expand and compress c. measures the electrical activity of the heart d. measures the pressure of blood when the heart contracts and relaxes

Explain how sequences of amino acids in proteins can be used to reveal relationships among organisms.

What do you need to use in order to work as an environmental scientist? you need to use the scientific method and__ in order to work as an environmental scientist.