Answer:A
Explanation:Ice on the leg for 20 minutes has no effect on the prevention of DVT
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Step 1: Isolate the two kinds of DNA.
Step 2: Treat the plasmid and foreign DNA with the same restriction enzyme.
Step 3: Mix the foreign DNA with chopped plasmids.
Step 4: Add DNA ligase.
Answer:Fences, loud alarms, and keeping animals in a safe space
Explanation: