A human embryologist examines a 3-week-old embryo and notices that it has not developed a notochord. If the embryo survives, it will lack
A) a heart and lungs. B) skin and blood vessels.
C) a stomach and a pancreas. D) a brain and a spinal cord.
D
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Some immature B cells are reactive to self-antigens but do not become activated even when exposed to high concentrations of self-antigens
Indicate whether the statement is true or false.
Given that full sunlight has an intensity of approximately 10,000 ft-c, is photosynthesis in the field generally limited by light?
a. Yes b. No
The reason bread dough "rises" is due to the production of
A) lactic acid. B) carbon dioxide gas. C) ethanol. D) oxygen gas.
Please choose the answer that best fills in the blanks of this sentence in the correct order. A ________ infectious disease, such as a urinary tract infection, is not transmitted from person to person, whereas an infectious disease which is transmitted from one person to another, such as influenza, is referred to as a ________ infectious disease.
A) Communicable; noncommunicable B) Noncommunicable; communicable C) Communicable; contagious