Until which period of time did scientists think
that molecules of life could only be made
inside living organisms?
a. early 1500s
b. late 1500s
c. early 1600s
d. late 1600s
e. early 1800s
E
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The USDA requires that food products from genetically modified organisms be clearly labeled as such
a. True b. False
All of the following describe characteristics of sclerenchyma cells, except which?
A. Their secondary walls may be impregnated with lignin. B. Their function is primarily to transport oxygen and carbon dioxide throughout the leaf. C. They have thick, tough secondary walls. D. They lack living protoplasts when mature. E. They form fibers and sclereids.
The amount of Earth's surface required to support a particular level of development and consumption in a sustainable fashion is called:
a. carrying capacity b. replacement rate c. ecological footprint d. demographic transition e. logistic growth
Mesoglea is found in which of the following groups?
a. sponges b. cnidarians c. round worms d. annelids e. mollusks