Answer:
The bones of skeletal system serve to protect the body's organs and support the weight of the of the body ,giving the body it's shape
Explanation:
The muscles of the muscular system attach to these bones, pulling on them to allow for movement of the body
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Some populations are related to others
The surfactant is produced by great alveolar cells (granular pneumonocytes, a cuboidal epithelia), which are the most numerous cells in the alveoli, yet do not cover as much surface area as the squamous alveolar cells (a squamous epithelium<span>).
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Number of covalent bonds by an atom is equal to number of unpaired electrons.
<h3><u>Explanation:</u></h3>
Valency of an atom is defined as the combining capacity of an atom. Valence electrons are defined as the number of electrons in the outermost shell of an atom.
Now for an atom, when more than one electrons are present, then they often forms a pair. Like for example, if there are 7 valence electrons, 6 get as pairs and only one electron is unpaired. So this is why the halogens like fluorine, chlorine etc has the Valency of 1. For oxygen, 4 valence electrons become paired. And rest 2 electrons form 2 covalent bonds.