Food is usually kept from entering your trachea by the Epiglottis
Answer:
According to a recent National Institutes of Health (NIH) estimate, 90% of cells in the human body are bacterial, fungal or other non-humans. Many scientists concluded that bacteria enjoy a commensal relationship with their human hosts. Microbes not only live outside the human but live equivalently inside the human body that keeps him healthy.
Scientists called human skin a “virtual zoo of bacteria”. Some scientists compared the diversity in the human gut to a rain forest. The human gut alone contains on average 40,000 bacterial species.
According to the Human Microbiome Project in 2007, dozens of research teams have gathered data that redefine what it means to be human. Some commentators have gone so far as to refer to the human body as a superorganism whose “whose metabolism represents a combination of microbial and human attributes.
<span>The primordial germ cell in the embryo undergoes mitosis to produce a spermatogonial stem cell.
The spermatogonial stem cell undergoes mitosis. The new cells could either be stem cells or spermatogonium cells.
The spermatogonium undergoes mitosis to generate a primary spermatocyte.
*** Up until this point, all cells are diploid ****
The primary spermatocyte (diploid) undergoes MEIOSIS I to generate TWO haploid secondary spermatocytes.
Each secondary spermatocyte undergoes MEIOSIS II to generate a total of FOUR early spermatid.
The spermatid mature in the seminiferous tubule, and once they are completely mature they are released into the lumen.
Now called sperm cells, they pass into the epididymis, where they are stored until time to be released during ejaculation
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Answer:
high melting point
Explanation:
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