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.
Answer: C. Resources can be unavailable in areas where they are needed
Explain: resources on earth surface for an evenly distributed most resources are unavailable where they are actually needed. Foreign exchange and internal trade brings the resources into distribution between the nation.
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The Y chromosome likely contains 70 to 200 genes that provide instructions for making proteins. Because only males have the Y chromosome, the genes on this chromosome tend to be involved in male sex determination and development.
<h3>What is a chromosome?</h3>
A chromosome is a lengthy DNA molecule that contains all or a portion of an organism's genetic code. Histones, which serve as packing proteins for the majority of eukaryotic chromosomes, work with chaperone proteins to attach to and condense the DNA molecule in order to preserve the integrity of the molecule. These chromosomes exhibit a complicated three-dimensional structure that is crucial for controlling transcription.
Under a light microscope, chromosomes are typically only discernible during the metaphase of cell division (where all chromosomes are aligned in the center of the cell in their condensed form).
Prior to this, each chromosome undergoes a process known as chromosome duplication (S phase), during which a centromere connects both copies, forming either the X-shaped structure (if the centromere is situated equatorially) or a two-arm structure (if it is situated distally) depending on where it is situated.
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