Answers by David Ortiz
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Answers by David Ortiz

Answers by David Ortiz
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In a chemical reaction such as photosynthesis, ____ are the substances present before the reaction.
answered Nov 24, 2018
6 votes
153k views
In general, rocks of the continental crust are less dense than rocks of the oceanic crust. a. True b. False
answered Aug 31, 2018
6 votes
178k views
Which sentence contains a correctly punctuated appositive phrase? 1) Dr. Banks, our family doctor, was born in Colorado. 2) Dr. Banks our family doctor was born in Colorado 3) Dr., Banks, our family doctor
answered Mar 1, 2018
1 vote
4.7k views
What are the main points of Oparins’s theory of Origin of life? Make a five
answered Apr 28, 2017
6 votes
109k views
Find the exact value by using a half-angle identity. sin(5pi/12)
answered Apr 24, 2017
1 vote
155k views
Which best describes the way historians consider letters and journals? a)primary source documents that are useful in the study of history b)reliable sources for the study of history only if from a named
answered Feb 2, 2016
4 votes
64.7k views
Which evolved during the Paleozoic Era? A. saber-toothed cats B. the first humans C. bacteria that could produce oxygen D. earth’s first land plants
answered Dec 23, 2015
6 votes
224k views
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