Question

covariance is affected by_____

change of origin
change of scale
both a and b
change of properties​

Answer 1

Answer:

Isotopes are atoms of the same element with different numbers of neutrons. Because they contain different numbers of neutrons, isotopes have different atomic masses. The average atomic mass of an element is calculated by taking the weighted average mass of the element's naturally occurring isotopes.

Answer 2

Answer:

here is the answer

2 only