About how many million years ago did humans of the genus Homo first inhabit eastern Africa?
a. 2
b. 4
c. 6
d. 8
e. 10
ANSWER: a
You might also like to view...
As big as it is, the ocean is nutrient-limited. If you wanted to investigate this phenomenon, one reasonable approach would be to _____
A) follow whale migrations in order to determine where most nutrients are located B) observe Antarctic Ocean productivity from year to year to see if it changes C) experimentally enrich some areas of the ocean and compare their productivity to that of untreated areas D) compare nutrient concentrations between the photic zone and the benthic zone in various marine locations E) contrast nutrient uptake by autotrophs in marine locations that are different temperatures
Describe one way that a protist can make you sick. In your answer, name and describe at least two specific prokaryotic structures involved in pathogensis
What will be an ideal response?
Which of the following statements about the monomers and polymers found in living organisms is false?
A) Cells typically make all of their macromolecules from a set of 40-50 common monomers and a few other ingredients that are rare. B) The monomers used to make polymers are essentially universal. C) Monomers serve as building blocks for polymers. D) Monomers are joined together by the process of hydrolysis.
Post-exposure prophylaxis for rabies includes shots of HRIG (human rabies immune globulin) and rabies vaccine. The HRIG provides ________ whereas the vaccine promotes the development of ________.
A. natural passive immunity; artificial passive immunity B. artificial active immunity; natural active immunity C. artificial passive immunity; artificial active immunity D. artificial active immunity; artificial passive immunity E. artificial passive immunity; natural active immunity