Animal sounds and signals are considered language because: select all that apply.
a. they are completely arbitrary
b. they are not considered language
c. they are governed by rules for usage
d. they are uniform and conventional
e. they are used to communicate

no , per capita income is not a true measure of the development because: -it only tells us about average income not how income is distributed among the people.it only give us an idea of the economic aspect.it is only at the qualitative basis.moreover, income is not only the way of development other factors are also as much as important as income.

answer; /// i believe that the correct answer is (a) making presentations;