The organisms that live in a kelp forest and the sediment or rocks the kelp uses to attach to is an example of what?
a. None of these choices
b. An ecosystem
c. Biosphere
d. Ecology
b
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A genus in the family Enterobacteriaceae that is a major pathogen of crop plants is ________.
A. Erwinia B. Shigella C. Yersinia D. Proteus
__________ and _________ are released by neurons of the adrenal medulla and cause a fight-flight response. Fill in the blank(s) with the appropriate word(s)
Why is DNA replication considered semiconservative?
A) DNA is created from only four of nine available nucleotides. B) The DNA molecule includes a parental strand and newly created DNA strand. C) DNA is not just one strand but two complementary strands. D) DNA is divided into a top half and a bottom half before replicating.
Which pairing of occurrence and date is NOT correct?
Select one: a. origin of invertebrates—630 million years ago b. origin of life—4.6 billion years ago c. origin of eukaryotic cells—2.1 billion years ago d. origin of prokaryotic cells—3.5 billion years ago e. chordate evolution—545 million years ago