2, 4, 5-T is a herbicides the persistent of which in soil is approximately;
a. 20 days
b. 20 week
c. 20 month
d. 20 year
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Rocks are made of one or more minerals. There are three main classifications of rock, based on the way the rock was formed: sedimentary, metamorphic and igneous. Soil is formed of fine rock particles mixed with air, water and particles from dead plant and animal matter.
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