What human organ is formed from two genetically different tissues?
A. Uterus
B. Neural crest
C. Neural tube
D. Placenta
Answer: D
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Scientists speculate that extinctions did not occur in Africa as they did on other continents because animals coevolved with _______ in Africa.
A. plants B. diseases C. parasites D. humans
Antibiotics can kill ________________ in the human body, which may sometimes lead to health problems such as inflammatory bowel disease
A. harmful bacteria B. beneficial bacteria C. both harmful and beneficial bacteria D. fungi E. archaeons
A solution with a pH of 2 has how many more protons in it than a solution with a pH of 4?
A. 100 times more B. 5 times more. C. 1000 times more. D. 10 times more.
Which of the following statements is true?
a. Arteries carry only oxygenated blood. b. The systemic circuit leaves the heart from the left ventricle. c. Blood passes through only one capillary bed on its trip through the systemic circuit. d. Platelets survive a longer time than erythrocytes. e. The heart is able to pick up the oxygen it needs as the blood flows through it.