1. Which of the following can happen if the kidneys fail?
a. Toxic wastes can accumulate in plasma.
b. Blood-plasma ion levels can increase.
c. Kidney dialysis may be necessary.
d. All of the above

the most common type of reef is the fringing reef. this type of reef grows seaward directly from the shore. they form borders along the shoreline and surrounding islands.

colors do exist. the color of the sky is actually violet; humans percieve the color of the sky as blue.