The spinal cord is made up of

A. the pons and the medulla

B. The brain and the brain stem

c. white and gray matter

D. gray matter only

Tell a story from the perspective of an oxygen molecule traveling thorugh the body.

According to the cladogram which group of organisms is the closest relative to chordates

Which sedimentary rock forms through the accumulation of the remains of living organisms?

Why does an adult not have as many bones as a child?

The hollow area left in a rock from a former organism is a (n) :

Which best explains how the body maintains homeostais? A. All systems work together to match the external environment B. All systems work together to stabilize the body C. Each system works interdependently to stabilize the body D.

It is an effect that drug use can have on society? A. Drug use increases pollution. B. Drug use leads to an increase in criminal activity. C. Drug use increases the spread of disease. D. All of the above

Which of the following affects the speed of light waves in a material? Angle at which the ray strikes the medium Color of the material Density of the material Temperature of the light wave

What does the nosepiece do on a microscope

What does a scale measure