In which of the following is primary productivity highest?

A. tropical forests
B. prairies
C. cool deserts
D. hot deserts
E. the Arctic


A. tropical forests

Biology & Microbiology

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In chordates, the notochord forms from the endoderm layer that is ventral to the developing digestive system

a. True b. False

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The outer coat of pollen grains is called sporopollenin, which is made of ________

a. cellulose b. an unknown substance c. protein d. glycolipid

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Diffusion is the movement of atoms or molecules from regions of high concentration to regions of low concentration

a. True b. False

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A patient has been diagnosed with a major cancer, which has spread. Which treatment would be the best choice?

1.surgical removal 2.monoclonal antibodies 3.chemotherapy 4.radiation therapy

Biology & Microbiology