The tough, pliable body of a lichen is called a(n)
a. soredium.
b. arbuscule.
c. thallus.
d. sporangium.
e. haustorium.
C
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Carbon has 4 valence electrons and oxygen has 6 . Carbon dioxide would contain _____
A. four hydrogen bonds B. two single covalent bonds C. two double covalent bonds D. one single covalent bond
During the S period of interphase
(a) cell growth takes place. (b) nothing occurs because this is a resting period. (c) chromosomes divide. (d) synthesis (or replication) of the nucleoproteins takes place.
A response to change in the internal/external environment that intensifies the change is called ____ feedback
a. positive b. physiological c. reflex d. negative e. anatomical
Weight loss dieting in humans has been shown to ____
a. increase absolute numbers of Firmicutes bacteria b. decrease absolute numbers of Firmicutes bacteria c. increase the abundance of Firmicutes bacteria relative to Bacteroidetes bacteria d. decrease the relative abundance of Firmicutes bacteria relative to Bacteroidetes bacteria e. not affect bacterial populations in human intestines