In the 1990s, many scientists agreed that the five-kingdom classification scheme should be expanded to six kingdoms. which discovery
supported this decision?
a
fungi differed significantly from both plants and animals
b. two groups of monerans-eubacteria and archaebacteria--differed significantly from one another
c
protists are not a true kingdom, and should be classified in at least two different kingdoms
d. fungi are not a true kingdom, and should be classified in at least two different kingdoms

B. Two groups of monerans-Eubacteria and Archaebacteria--differed significantly from one another

Explanation:

It was Carl Woese who divided the prokaryotes into 2 kingdoms, Eubacteria and Archaebacteria based on RNA studies. So. this led to additional 6th classification added to Whittaker's classification of 5 kingdoms.

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.