In this freshwater aquatic ecosystem, species
composition varies along its length based on
rock types, depth, oxygen concentrations, and
temperature.
a. streams
b. lakes
c. estuaries
d. coral reefs
e. hydrothermal vents
A
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Studies by Emil von Behring and Shibasaburo Kitasato demonstrated that inactivated toxins can induce the synthesis of antitoxins in the blood of rabbits. These antitoxins (antibodies) are the basis of
A. humoral immunity. B. phagocyte-mediated immunity. C. cell-mediated immunity. D. antibiotic immunity.
Cleavage is indicated by
a. A. b. B. c. C. d. D. e. E.
Each archegonium produces many eggs
_____________________ Indicate whether the statement is true or false.
Which of the following controls fluid balance by reabsorption of water and sodium?
A) aldosterone B) antidiuretic hormone C) osmoreceptors D) chemoreceptors