Which best compares and contrasts how John Newlands and Dmitri Mendeleev organized elements? Both Newlands and Mendeleev arranged elements according to their chemical properties, but only Newlands used a
mass as well.
O Both Newlands and Mendeleev arranged elements according to their atomic masses, but only Mendeleev used cherr
properties as well
Both Newlands and Mendeleev organized elements into groups, but only Newlands used a table with rows and column
Both Newlands and Mendeleev organized elements into a table with rows and columns, but only Mendeleev named
different groups of elements.

Scientist: cross-sections of stalactites—calcite formations deposited on cave ceilings by seeping water—can reveal annual variations in rainfall in particular areas over hundreds and thousands of years. we often found that when—according to these cross-sections—drought occurred in a particular area, it coincided with the collapse of an ancient society in that area. i hypothesize that drought reduced agricultural productivity in these areas, thereby leaving these societies without the resources needed to handle internal stresses and external threats. which of the following, if true, would most weaken the support for the scientist's hypothesis? a. many droughts indicated in the cross-sections of stalactites do not correspond with the collapse of a society in that area. b. information from the cross-sections of stalactites alone cannot reveal the level of agricultural output in an area at a particular time. c. most of the societies that collapsed during droughts did so when internal power struggles coincided with military raids from neighboring societies. d. most of the societies that collapsed during droughts maintained large stockpiles of food and water at the time of their collapse. e. information from stalactites also suggests that the collapse of some societies coincided with periods of abnormally high rainfall.