In certain environments the dead remains of sphagnum accumulate to form thick deposits of

Sphagnum is a genus of the Phyllum Bryophyta. It is commonly called as peat moss. A sphagnum grows in a wetland of marshes. These mosses store large amount of water. When these plants die in the wetland, the hard remains left after decomposition is a main source of soft coal reserve called as peat.

the answer is sex-linked recessive.

the law of original horizontality explains:   why rocks appear in layers. correct answer: b the law suggests that all rock layers are originally laid down (deposited) horizontally and can later be deformed.   the principle is used by geologists to make assumptions about the relative ages of sedimentary rocks.