Mr. Brown used the model shown below when discussing plant cells with his class.
What is the best reason for using this model?
A. Real plant cells can only be viewed with a powerful hand lens.
B. Plant cell parts cannot be seen with modern microscopes.
C. The model is made out of the same materials as the real cell.
D. The model is easier to view since real plant cells are very small.

Drag the correct tiles to the image. not all tiles will be used. the diagram is a schematic representation of the electron transport mechanism in mitochondria. label the diagram to complete the model.

What causes darkening of the skin as melanin production increases

Crinoids, also known as sea lilies, appear to be sea plants but are not plants at all. crinoids are an echinoderm species which uses anchoring structures called holdfasts to attach themselves to the sea floor. crinoids were most abundant in pennsylvania during the mississippian period, which ranged from 375 to 320 million years ago. fossils of the crinoids shows that during most of this time pennsylvania was that provided favorable conditions for crinoid growth. a) glacial terrain b) a dry and sandy plain c) mostly mountain ranges d) covered by warm, shallow seas