Answer:
Mechanical barriers — which include the skin , mucous membranes , and fluids such as tears and urine — physically block pathogens from entering the body. Chemical barriers — such as enzymes in sweat , saliva , and semen — kill pathogens on body surfaces.
Virtually any behavior can have sociological imagination<span> applied to it.</span>
Detritus: "Waste or debris of any kind" (thx google)
Answer:
Coal
Explanation:
Helped work become faster.
Answer and Explanation:
If an objective lens of 400x has a DFV of 500цm
then what would be the DFV of 1000x=?
1000*500/400
=1250цm
1mm=1000цm
? = 1250цm
1250*1/1000
=1.25mm
