Which of the following organisms are most closely related evolutionarily? A.
starfish and sand dollar
B.
fish and starfish
C.
fish and clam
D.
crab and starfish

One of the largest seafood exporters to the united states is a. china b. brazil c. mexico d. saudi arabia

In which situations is the principle of cross-cutting relationship useful in determining relative age?

Which of the following is not a symptom of desertification? a) decrease in salt content of the soil b) lowering of the water table c) reduced surface water d) increased soil erosion e) loss of native vegetation