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ill 82% One primary characteristic of chromosomes is that chromosomes are located in the center of cells, called the nucleus. ... Each chromosome actually features protein and a single DNA molecule. The DNA remains wrapped around histones, which are spool-like proteins, because of the unique structure of chromosomes.

air, water, heat and noise pollution can all be caused by producing and using technology. consuming resources - non-renewable resources, including precious metals like gold, are used to make technology

hormones in blood stream

image: dtc.ucsf.edu

endocrine glands secrete hormones into the blood stream near them; the hormones then travel in our bloodstream until it reaches its destination, called a target cell, in distance parts of the body. in the target tissue, hormones lock onto the target’s plasma membrane, called the receptor site.