Where does lymph that has been cleaned of infectious agents return to the bloodstream?
a. within the lungs
b. above the duodenum
c. before the right atrium
d. around the liver
c. before the right atrium
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Most human pathogens grow best at temperatures near
A. 20ºC. B. 25ºC. C. 37ºC. D. 45ºC.
Answer the question using the accompanying figure. Of the fragments labeled A-D, which is closest to the positive
electrode?
a. A b. B c. C d. D e. it is impossible to tell
Which vertebrate body system is most closely associated functionally with respiration?
a. urinary b. digestive c. endocrine d. circulatory e. integumentary
The basis of heredity was the direct result of critical and logical thinking. After considering alternative scientific explanations to explain the data he obtained, Gregor Mendel laid the foundation for genetics. His conclusions were based on carefully planned investigations. What organism did Mendel select to carry out his investigations?
A) snapdragon plants B) fruit flies C) mice D) pea plants