The two countries that are the largest emitters of greenhouse gasses are
A) Russia and the United States of America.
B) Canada and the United States of America.
C) China and the United States of America.
D) China and Mexico.
E) China and India.
C
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The central nervous system includes only ________
a. the brain and spinal cord b. afferent axons that carry sensory signals into the brain c. efferent axons that relay commands from the brain and spinal cord d. nerves that extend outside the brain and spinal cord
Mitosis can occur during any phase of the cell cycle.
a. true b. false
The microorganisms that recycle nutrients by breaking down dead matter and wastes are called
A. prokaryotes. B. eukaryotes. C. pathogens. D. decomposers. E. fermenters.
Which of the following is a process by which an initial set of genes turns on a second set of regulatory genes, which eventually turns on a third set of genes?
A) the sonic hedgehog sequence B) the genetic cascade C) developmental chain reaction D) somite production E) gastrulation