How to prevent pregnancy implanted progestins contained in porous silicone?

Hello,

To prevent pregnancy implanted progestins contained in porous silicone tubes are inserted under the skin.

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j548831

a chair, a bed, and a toothbrush

explanation:

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.