D! The Cell membrane in found in all cells, and it is a single (mono) layer.
<span> C - nitrogen fixation, ammonification and nitrification </span>
Single seismograph can register the occurrence of an earthquake. Analysis of the waves can yield the distance between the sensor and the epicenter. This describes a circle with the seismograph at the center. ... Adding data from a third station pinpoints the epicenter as the only place where all three circles intersect