Which statement best describes engraving? a. it involves the use of acid to make lines. b. it produces images using halftones instead of lines. c. it creates images using chemical processes. d. it involves the use of a burin to cut lines.

The answer is D. It involves the use of a burin (Basically a knife or sharp engraving tool) to cut lines.

option c (nickel) is not found in earth's crust. the earth's crust basically contains eight (8) elements namely: oxygen, silicon, aluminum, iron, calcium, sodium, potassium and magnesium (listed in order of abundance).

for those of you who searched "which list includes four types of animal-like protists? " and keep getting these results, the answer is c: flagellates, sarcodines, ciliates, parasites