Ava conducted an experiment to determine respiratory rates during different activities. She counted the number of breaths per minute. Ava noted that the number of breaths increases as physical activity increases. Why is there an increase in the number of breaths per minute as activity increases?
A As activity increases, more oxygen is exhaled.
B As activity increases, breathing becomes more efficient.
C As activity increases, the oxygen needs of cells increase.
D As activity increases, the rate of the heart beating increases.
C As activity increases, the oxygen needs of cells increase.
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Which of the following is not one of the groups of streptococci?
A. Dermal streptococci B. Oral streptococci C. Pyogenic streptococci D. None of the choices are correct.
A cross between homozygous red-eyed flies and homozygous white-eyed flies results in progeny that all have red-eyes. This result demonstrates:
a) dominance. b) the law of independent assortment. c) a blending of alleles. d) the norm of reaction. e) a dihybrid cross.
Most of the oligotrophic proteobacteria are found in the ________.
A. alpha proteobacteria B. delta proteobacteria C. beta proteobacteria D. gamma proteobacteria
Within the embryo sac of the angiosperm, ________ nuclei are arranged in precise positions.
A. 2 B. 4 C. 6 D. 8 E. 10