What do scientists think is the dominant force that drives plate movements?
a) convection cells within the outer core b) slab pull from subducted plates
c) convection cells within the asthenosphere
d) slab push from seafloor spreading
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Ответ:
C) convection cells within the asthenosphere.
Explanation:
Scientist have had this theory for the past quarter of a century and they still believe it.
Ответ:
Cell wall
Explanation:
The cell wall is made up of the cellulose, hemicellulose, and pectin polymer chains that crosslink tighly. These fibers are tough giving the cell wall in plants its inflexibility especially if there are additional molecules embedded in the crosslinks such as lignin. This gives the cells of plant rigidity that are important in the support of a plant. The cell wall also protects the cells of plants from turgor pressure (also needed for support) that would easily lyse an animal cell.
The pores of the cell wall are nonetheless larger than those of the cell membrane hence larger molecules pass through the cell-wall than they would across the cell membrane.