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Phytoliths may also provide plants with protection.

These rigid silica structures help to make plants more difficult to consume and digest, lending the plant's tissues a grainy or prickly texture.

These plants take up silica from the soil, whereupon it is deposited within different intracellular and extracellular structures of the plant. Although some use "phytolith" to refer to all mineral secretions by plants, it more commonly refers to siliceous plant remains.

In contrast, mineralized calcium secretions in cacti are composed of calcium oxalates.

Phytoliths also appear to provide physiologic benefits.

Radiometric dating is used to estimate the age of rocks and other objects based on the fixed decay rate of radioactive isotopes.

Radiometric dating, or radioactive dating as it is sometimes called, is a method used to date rocks and other objects based on the known decay rate of radioactive isotopes.

I can do this by working from the definition of "half-life": in the given amount of time (in this case, hours.

I do not have the decay constant but, by using the half-life information, I can find it.

If possible, the ink should be tested, since a recent forgery would use recently-made ink.

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