An earthworm detects sound
a. through specialized tympanic membranes located near the head.
b. through a thinned region of the exoskeleton.
c. through general mechanoreceptors on its skin.
d. by using a specialized organ that measures the frequency of vibration of the surrounding
dirt particles.
e. through a series of mechanoreceptors arranged in a lateral line.
C
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Using visual observation of phenotypes to identify allele frequency rarely works because:
A. most alleles are recessive and will not produce a visible phenotype. B. phenotype is not due to the alleles. C. multiple genes may control the phenotype. D. visual phenotypes are rare. E. phenotype is not an indication of genotype.
The ultimate electron acceptor in aerobic respiration is ____
a. NAD+ b. CO2 c. ADP d. NADP+ e. O2
What nonendocrine organ produces erythropoietin, which stimulates red blood cell production in the bone marrow?
A. kidneys B. skin C. heart D. pituitary E. liver
Beryllium's atomic mass is 9, and its atomic number is 4. How many neutrons are found in a beryllium atom?
A) 9 B) 13 C) 4 D) 5