6. 89-103
6. noble gasses
8. NO !! electrons didn’t exist wen mendeleev was around
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Answer:The endocrine system is made up of glands that produce and secrete hormones, chemical substances produced in the body that regulate the activity of cells or organs. These hormones regulate the body's growth, metabolism (the physical and chemical processes of the body), and sexual development and function.
Explanation:
<span>Human immunodeficiency virus is spread by contact with bodily fluids. While most often transferred through sex or blood, it can not be spread simply by kissing another person unless you have a cut in your mouth.</span>
The olfactory epithelium is a specialized epithelial tissue inside the nasal cavity that is involved in smell. In humans, it lies on the roof of the nasal cavity about 7 cm above and behind the nostrils.
Answer:
smaller single celled organisms have a high surface area to volume ratio cause surface area to the volume ratio smaller as the cell grows larger. if a sell grow beyond the limit not enough material will be able to cross the membrane fast enough to accommodate the increased cellular volume