In the expression 2H2S + 3O2 ® 2H2O + SO2, which is the acid?
A. H2S
B. O2
C. SO2
D. H2O
A. H2S
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A water sample from a hot thermal vent contained a single-celled organism that had a cell wall but lacked a nucleus. What is its most likely classification?
A) Eukarya B) Archaea C) Animalia D) Protista E) Fungi
Place the five steps of digestion in most animals with a digestive tube in the proper order
a. absorption ?enzymatic hydrolysis ?mechanical processing ?secretion of enzymes ?elimination b. absorption ?mechanical processing ?enzymatic hydrolysis ?secretion of enzymes ?elimination c. mechanical processing ?absorption ?secretion of enzymes ?enzymatic hydrolysis ?elimination d. mechanical processing ?secretion of enzymes ?enzymatic hydrolysis ?absorption ?elimination
e. mechanical processing ?secretion of enzymes ?absorption ?enzymatic hydrolysis ?eliminationClay compounds were thought to be original
sites for the formation of
a. nucleotide strands. b. fat globules. c. short polysaccharides. d. amino acid chains. e. sugar-protein complexes.
The type of location where a species lives is its ________
Fill in the blank(s) with correct word