Examlex
Which one of the following is an example of a natural barrier to entry of new firms into an industry?
Mucus
A slippery secretion produced by mucous membranes, serving to moisten and protect them.
Ejaculation
The process of releasing semen from the penis during sexual arousal or orgasm.
Fallopian Tubes
Tubes through which eggs travel from the ovaries to the uterus in the female reproductive system.
Ejaculation
The expulsion of semen from the body during sexual arousal in males.
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