1 Some DMMs can simultaneously measure and display the ac and dc components of a signal. 2  The DMM display can show results three ways (see illustration below): 3  The ac portion of the signal appears in the primary display and the dc portion in the smaller secondary display.
Each lichen specie is one alga species plus one fungus. The alga, a microscopic green plant, makes the food for the duo, while the fungus, a non-green plant, gives the pair support and soaks up moisture.
It is often thought that lichens are a fungus or disease that is damaging the plant but in reality that is not the case. Lichens are unique organisms. It is a fungus and algae combined to live together. Although lichens really do not look like a fungus or algae both work together so that lichens can survive.