How many layers of vascular cambium will there be in the trunk of a 10-year-old tree?
A) one
B) two
C) ten
D) thousands
Answer: A
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Which conclusion is best supported by these data?
1.Infected children lived in areas with greater numbers of mosquitoes.
2.A higher number of mosquitoes were attracted to children that contained gametocytes.
3.Plasmodium secrete a chemical that mosquitoes can detect in the air.
4.Children without Plasmodium infection were least attractive to mosquitoes.
These cells are responsible for producing antibody molecules.
A. neutrophils B. basophils C. antigen-presenting cell (APCs) D. B-cells
The earliest humans primarily used tools to ____.
A. assist in locomotion B. provide protection C. facilitate the processing of food D. ward off predators E. construct shelters
Ammonia, urea, and uric acid
A. are all equally toxic. B. are all produced by the kidney. C. all require about the same amount of energy to produce. D. are all nitrogenous wastes. E. all require large amounts of water for excretion.