Stems are composed of a fibrous material made of dead cells and contain high concentrations of lignin and cellulose, while stems do not contain this fibrous material.

the "power" of a lens is its resolution power, or its ability to distinguish between to closely located points. with the low power lens, it is likely you will see the rough form of the hay and maybe some movement of dots around the hay. however, when observed with the high power lens, the detailed features of the hay become visible and the microbes being grown are more clearly visible.

i hope this you

a = executive branch; b = judicial branch

answerblank(1); ecological; blank(2); evolutionary;

lichens that colonize bare rock secrete acids that break down the rock and start the soil-production process. so they expose rocks