There is a scheme of a reaction, where the first reactant is slowly added to the second reactant in the presence of CH3CH2O minus followed by HCl. The first reactant consists of a carbon atom single-bonded to a CH2CH3 group and an OCH2CH3 group and double-bonded to an oxygen atom. The second reactant consists of a carbon atom single-bonded to a pair of OCH2CH3 groups and double-bonded to an oxygen atom.

b is the correct

smooth muscle is composed of involuntary muscles found within the walls of organs and structures such as the esophagus, stomach, intestines, and blood vessels. those muscles push materials like food or blood through organs. unlike skeletal muscle, smooth muscle can never be under your control.

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.