Which of the following is used to cause flocculation?
A. charcoal
B. methane
C. chlorine
D. aluminum potassium phosphate (alum)
D
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What key assumption of the endosymbiotic theory is observed in living animals?
What will be an ideal response?
On which continent would you have seen the very earliest members of Homo sapiens?
A. Europe B. Africa C. Australia D. Asia
Which animal obtains additional oxygen by cutaneous respiration?
A. birds B. shrews C. frogs D. crocodiles E. turtles
In a circulatory system with double circulation, __________.
a. blood is pumped at two separate locations as it circulates through the body b. blood is pumped twice by the same heart in order to complete a cycle of picking up oxygen and delivering it to the tissues c. there is a countercurrent exchange in the gills d. hemolymph circulates both through a pumping blood vessel and through body sinuses e. there are always two atria per heart ventricle