Cells are commonly dispersed (mixed in) with simple columnar epithelial cells. they are responsible for secreting mucus.
a. mast cells
b. ciliated
c. goblet cells
d. macrophages
e. red blood cells

Now it's your turn to investigate human impact around the world. grab your virtual lab coat and put on your environmental science hat. you will be taking a trip around the globe to explore three locations. at each location, you will investigate the cause and effect relationships of deforestation, desertification, and urbanization. you will also gather evidence of how these factors have impacted the environment over time

Select three sports that require participants to be highly fit before the beginning a: snowboarding b: skydiving c: rock climbing d: bungee jumping e: free diving f: hiking

Which of the following is not a possible effectof increasimg carbon dioxide levels in the atmosphere ?