A change in a gene due to damage or incorrect copying is called
a evolution.
c. segregation.
b. meiosis.
d. a mutation.

Option D). a mutation.

Explanation:

Mutation is the change in the genetic composition of the cell. This change in a gene can be due to

- spontaneous change in nitrogenous base

- error during replication i.e incorrect copying of DNA template strand

- damage to DNA by ionizing radiation such as X-rays

- damage to DNA by heavy metals such as cadmium, lead etc

Thus, mutation is the answer.

endo:

regulates body hormones, aldosterone, vasopressin

neural:

signal, regulates body using electric signals, reflex

endo has to do with hormones; aldosterone and vasopressin are both hormones. i also had this question and got it right : d

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.