At the end of the ________ period, over 96% of marine species and many terrestrial species became extinct, possibly because intense volcanic activity warmed Earth's climate
A) Quaternary
B) Permian
C) Cretaceous
D) Devonian
Answer: B
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Which of the following correctly describes the immediate and short-term responses of populations during the first 20 years following the fire? a. All populations except the grasses increased following the fire. b. All populations except the grasses decreased following the fire, but then became reestablished
c. There was no change in the grass population due to the fire, they increased initially after thefire and then began to decline. d. Both b and c above.
The figure illustrates a portion of the life cycle
of a(n) a. zygomycete. b. ascomycete. c. basidiomycete. d. glomeromycete. e. lichen.
Which of the following is true concerning postnatal development?
a. Infancy is defined as the first two years of life after birth. b. Senescence results in increased hormone secretion. c. Postnatal development occurs before birth. d. In general, boys experience their pre-adolescent growth spurt later than girls. e. Early childhood is a time of rapid cell division in nerve cells.
When a base is added to a buffered solution, the buffer will ________
A) donate OH? ions B) accept water molecules C) donate H+ ions D) form covalent bonds with the base