Athick, black liquid formed from the buried remains of microscopic marine organisms is ?

The deserts of the sahara and australia are associated with

Which of the following is a way that minerals are used? a. industry construction technology d. all of the above

Which member of the following food chain will be least affected by ddt, a pesticide water pollutant, if bio-magnification is occurring? algae> zooplankton> crayfish> leopard frog> large mouth bass