A scientist studying a material has determined that 12C, 13C, and 14C occur in the material in a ratio of 1000:10:1. How did he most likely differentiate between these forms of carbon?
A. by the number of protons in 12C, 13C, and
14C
B. by the number of electrons in 12C, 13C,
and 14C
C. by the number of neutrons in 12C, 13C,
and 14C
D. by the biomasses of 12C, 13C, and 14C
E. by the number of positrons in 12C, 13C,
and 14C
C
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Regions above or below the optimal range of an environmental variable are called:
a. zones of stress. b. tolerance zones. c. optimal range areas. d. None of the above. e. b and c only.
A flock of birds with various beak sizes migrates to a new island where their traditional food is not available
However, there are plants that produce a variety of large nuts, which can be eaten by birds with the largest beaks, and plants that produce a variety of small, soft seeds, which can be eaten by birds with the smallest beaks. Over time, this population divides into two species with large and small beaks. This is an example of A) directional selection. B) stabilizing selection. C) disruptive selection. D) sexual selection. E) genetic drift.
Why do most individuals have more than one episode of the common cold in a season?
What will be an ideal response?
Ovulation occurs by a surge in the secretion of what hormone?
A. Progesterone hormone B. Estrogen hormone C. hCG hormone D. Luteinizing hormone E. Follicle stimulation hormone