From what structure did vertebrate lungs originally evolve?
a. fish gills
b. fish guts
c. fish lungs
d. fish throats
e. fish kidneys
B
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Briefly describe how toxic materials like DDT that have low concentrations in the water column affect organisms at distant locations
What will be an ideal response?
All of the following had their origin in tropical rain
forests EXCEPT a. wheat. b. coffee. c. chocolate d. cinnamon. e. none of these answers are exceptions
Regions of a specimen with higher electron density scatter ________ electrons and, therefore, appear ________ in the image projected onto the screen of a transmission electron microscope.
A. more; darker B. more; lighter C. fewer; lighter D. fewer; darker
Margaret had an unusual viral infection that damaged her posterior pituitary. Ever since, she has been excreting a large volume of dilute urine. The doctor tells Margaret that she has the disorder known as ________.
A. diabetes insipidus B. diabetes mellitus C. hypertension D. anti-diuresis E. atherosclerosis