The most important evidence that Darwin used
to develop his theory of natural selection came
from
a. the Argentine pampas.
b. his boyhood neighborhood in England.
c. the Galápagos Islands.
d. Australia and New Zealand.
e. South America.
C
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When muscles cells are deprived of oxygen, the heart still pumps. What must the heart cells be able to do?
A. derive sufficient energy from fermentation B. continue aerobic metabolism when skeletal muscle cannot C. transform lactate to pyruvate again D. remove lactate from the blood E. remove oxygen from lactate
The most abundant protein in mammals is collagen. This strong, ropelike molecule is particularly abundant in which tissue?
A. heart muscle B. spinal cord C. ligaments D. skeletal muscle
________ is the process by which cells become specialized
a. Differentiation b. Cancer c. Mutation d. Transcription e. Translation
Many human traits, such as our performance on intelligence tests or our susceptibility to heart disease, are ________.
A. determined only by our genes B. determined solely by environmental factors C. influenced by both genes and the environment D. determined by genes in some people and by the environment in other people