According to the ________ principle, a muscle cell contracts completely when adequately stimulated by a motor neuron
Fill in the blank(s) with correct word
all-or-none
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Heritability refers to
A) the genetic contribution to a phenotype in a population at a particular time. B) the genetic contribution to the variability of a phenotype in a population at a particular time. C) the number of genes contributing to a trait in a population. D) the degree to which offspring resemble parents.
The membranous labyrinth of the inner ear consists of the:a
saccule, utricle, and three semicircular canals. b. vestibular canal and oval window. c. cochlea, tympanum, and three bones. d. statoliths and hair cells. e. endolymph, perilymph, and the organ of Corti.
What is the most reasonable conclusion that can be made from data graphed in the figure? 
A. After high mortality early in life, survivorship becomes constant for the rest of life. B. After following a constant rate early in life, mortality becomes low late in life. C. Survivorship is constant throughout life. D. After low mortality early in life, mortality increases to a constant rate for the rest of life.
When water molecules "stick"to something that is not another water molecule, this is called
A. adhesion. B. water pressure. C. cohesion. D. root pressure. E. pneumatophores.