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Diatoms have cell walls composed of silicon dioxide.
A. silicon dioxide.
Answer:
Fractional or Ratio Scale: Afractional scale map shows the fraction of an object or land feature on the map. This type uses a set of numbers that represents the object or a landmark. As an example on the left photo, the orange-shadedscale represents a 2/3 fractional scale. 2.
Toxins in the soil would enter through the root system first.
Answer:
cell wall provides protection and structural support
