This animal has two atria and one ventricle and

two vascular circuits. This animal is



a. a frog.
b. a woodpecker.
c. an alligator.
d. a rat.
e. more than one of these.


A

Biology & Microbiology

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A positive tuberculin test means a patient

A) has active disease. B) has been previously exposed to Mycobacterium tuberculosis. C) has a current inappropriate infection. D) has active disease, has been previously exposed to Mycobacterium tuberculosis, or has a current inappropriate infection.

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A genetic disease that causes death in infancy and has an autosomal recessive inheritance pattern can persist in a population because: Check all that apply.

_____ it can be passed on to the next generation by a heterozygous carrier. _____ if both parents are carriers, they have a 50% chance of having normal children. _____ only homozygotes for the abnormal allele will have the disease. _____ individuals with one abnormal allele do not show symptoms of the disease.

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The typical osmolarity of body fluids in most freshwater invertebrates is about ____ mOsm/L

a. 5 b. 225 c. 300 d. 1000 e. 1500

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Amoeboid protozoans are autotrophic

Indicate whether the statement is true or false

Biology & Microbiology