Oceanic crust is best described as a. thin and young b. continuously replenished c. a majority of earth’s crust d. all of the above

The right option is;

c. a majority of earth’s crust  

Oceanic crust is the outermost part of the earth’s crust which lies under the ocean basins. The oceanic crust is denser, thinner, geologically younger, and has different chemical component when compared with the continental crust. The oceanic crust is made up of the lower oceanic crust which is composed of gabbro, troctolite, and ultramafic cumulates, and the upper oceanic crust which is composed of lavas made of basalt.

For anyone who comes across this the answer is all of the above.

Explanation:

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.

since there are no options posted i'll give you a few examples.

a dolphin's flipper, bird's wing, cat's leg.