Sperm penetration tests check to see whether a man's sperm can move through cervical mucus and the fallopian tubes to join with (fertilize) an egg. This test is usually done when a couple is having trouble becoming pregnant (infertility). There are different sperm penetration tests.
The idea that a boundary is shifting can be applied to different areas. A shifting frontier of science would be referring to the fact that science is always changing and growing, and always with new areas. In wartime, a shifting frontier would be an international border which is constantly being renegotiated.
A cultural boundary refers to the presence of some kind of cultural differencecultural boundaries are characteristic of all human societies, traditional as well as modern. A border is a social construct that is political in origin.Across a border power is exercised, as in the political border between two nations.e-examining the Rhetoric of the Cultural Border by Heewon Chang Eastern College This article was originally published in the Electronic Magazine of Multicultural Education. This essay examines the territory-based rhetoric of the cultural border, boundaries and borderlands.