Which of the following statements about oceanic carbon chemistry is true?
a. air-sea equilibration is the only factor affecting the amount of carbon in the oceans
b. warm surface waters are enriched in dissolved carbon dioxide as compared to the cooler deep waters
c. the reaction between dissolved carbon dioxide and carbonate ions to form bicarbonate significantly enhances the ocean’s capacity to store carbon
d. as dissolved carbon dioxide concentrations in the oceans increase, we should expect bicarbonate concentrations to drop and carbonate ion concentrations to rise

What do muslims believe a prophet is? a deity an angel a minister a messenger

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.

Many countries in africa have had difficulty creating democratic governments following their independence. all of the following issues have most likely contributed to this problem, except