Since 2000, the hypotheses that McBrearty and Brooks first presented about the Middle Stone Age (MSA) have been strengthened by archaeological evidence. According to this particular body of work, which of the following statements are true of MSA people?a -They had large social networks.
b -They had symbolic behavior.
c -They did not exhibit complex adaptive technologies, such as the creation of bone tools, shelters, and hearths.
d -They did not make use of personal adornment or decorations as later hominins did.
e -Their behavior was of comparable complexity to the behavior of Homo ergaster.

ok

explanation:

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.