Which of the following pairs is mismatched?
A) NaOH ? Na+ + OH- — base
B) HF ? H+ + F- — acid
C) MgSO4 ? Mg2+ + SO42- — salt
D) KH2PO4 ? K+ + H2PO4- — acid
E) H2SO4 ? 2H+ + SO42- — acid
D
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Which element's isotope is commonly used to determine when biological samples such as fossils, were formed?
A. oxygen B. hydrogen C. carbon D. nitrogen E. sulfur
A monoecious plant could have
a. separate male and female flowers on the same plant. b. flowers that have both stamens and carpels in the same flower. c. either a male flower or a female flower on the same plant but never both. d. a and b. e. b and c.
Which species has been affected by global climate change?
a. polar bear b. sharks c. woodpeckers d. grizzly bears e. tree frogs
Nutrient absorption mostly happens in the ____.
A. stomach B. small intestine C. colon D. pancreas E. esophagus