Our understanding of many of the evolutionary relationships among animals changed after those phylogenies were based on morphological and molecular data (as opposed to only using morphological data). Which of the following groups represents an example of this change? a. Lochotrophozora
b. Bivalvia
c. Brachiopoda
d. Placozoa

a. Lochotrophozora

Explanation:

Molecular research and studies complement morphological research and improve our awareness and knowledge of evolutionary history. Previously, morphological studies could only reveal to us the variations and distinctions, but molecular studies and phylogeny have enabled us to pinpoint the fundamental mechanism of this variation on a genetic level, as well as locate it down to evolutionary lineage, which has led to more enhanced genealogy and evolutionary studies.

However, the group of organisms that best reflects and represents this kind of change is: Lochotrophozora

littering streams           is the answer

your answer is "the 1950's"