The earliest vertebrates had jaws
____________________ Indicate whether the statement is true or false.
F, lacked
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The ability to form endospores in bacteria within Bacillales, Clostridiales, and Lactobacillales suggests the genotype/phenotype evolved
A) at least three separate times in these divergent orders. B) at least once, and horizontal gene transfer among relatives explains its presence in other orders. C) only once in an ancestor to these three orders, due to the high number of genes required. D) either at least once and horizontal gene transfer among relatives occurred or once in a common ancestor.
The transplant of pig bone marrow into a human recipient may overcome the ____________________ triggered by transplanted pig organs
Fill in the blank(s) with correct word
Studies have shown that in the flowering plant Arabidopsis the root-shoot axis is established
a. by the first cell division of the embryo. b. within hours after the seed germinates. c. during the torpedo stage of embryonic development. d. shortly after the eight-cell embryo stage. e. by plant tissues breaking through the seed coat and making contact with soil.
Specific immunity in the extracellular fluid is provide by mainly
A. IgA and IgE. B. IgG and IgM. C. IgE and IgG. D. IgM and IgD. E. IgD and IgA.