English
and space science sem 1 fall 2019
1 fall 2019
english v
a
the table shows index fossils.
which conclusion about paradoxides pinus is supported by
the information in the table?
cenozoic era
mesozoic era
quaternary period
tertiary period
cretaceous period
jurassic period
triassic period
permian period
pennsylvanian period
mississippian period
devonian period
silurian period
ordovician period
cambrian period
pecten gibbus
calyptraphorus velatus
scaphites hippocrepis
persphinctes biani
trophites subbultatus
leptodus americanus
dictyoclostus americanus
cactocrinus multibrachiatus
mucrospirifer mucronatus
cystophyllum niagarense
bathyurus extans
paradoxides pinus
life forms existed during the cambrian period.
similar fossil species formed after the devonian period.
this fossil species first appeared during the cenozoic
era
different life forms were surviving during precambrian
time.
paleozoic era
precambrian
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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.