IDNLearn.com is designed to help you find the answers you need quickly and easily. Find the solutions you need quickly and accurately with help from our knowledgeable community.

The ultimate source of phosphates that are vital to living organisms is
a. the humus found in soils
b. the phosphatic bones of the buried vertebrate skeletons
c. the chemical weathering of the small amounts of the mineral apatite found in rocks
d. the phosphoric acid found in acid rain


Sagot :