Shortage of resources <span />
Answer: A) Two atoms share electrons so they can fill their outer shells
Explanation: A covalent bond is a type of bond formed by sharing equal number of electrons between two non-metal atoms so that both of them can attain a stable octet or duplet structure of noble gases.
In covalent bonding, there is no loss or gain of electrons between atoms. For example, the formation of chlorine molecule, chlorine atom has seven electrons in its outermost shell, remaining one electron to attain an octet structure of noble gases. Two chlorine atoms share one pair of electron, each chlorine atom donating one electron to form a pair so that each atom in the chlorine molecule attains an octet structure..
Average kinetic energy is directly proportional to temperature, so when kinetic energy decreases so does temperature and when kinetic energy increases so does temperature.
<span>Addition of an enzyme, for example amylase will increase the rate at which the starch is broken down into glucose. Amylase functions by rupturing the disaccharide bonds between glucose molecules releasing these into solution. If iodine had been added as an indicator of the presense of starch, the color will fade from brown to very light in a short time.</span>
The 4 chambered heart is cheaper to maintain and manufacture.
