If you were to combine all of the ecosystems on the planet, you would have the ________
A) ionosphere
B) troposphere
C) biosphere
D) envirosphere
C
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Which molecule represents one of the best examples of a commonly shared signaling pathway connected to memory
in invertebrates and vertebrates?
a. cyclic AMP b. cyclic GMP c. RNA cyclase d. RNA binding protein e. non-responsive binding protein
Water enters the water vascular system of echinoderms through the:
a. spines. b. mouth. c. madreporite. d. tubercle. e. tube feet.
How many electron pairs are shared between carbon 2 and 3 in the accompanying figure?
a. one
b. one and a half
c. two
d. three
e. four
Why is He positioned above Ne in the periodic table?
A. They both have the same atomic number. B. They both have a full outermost orbital. C. They both have the same number of protons in their nuclei. D. They both have the same atomic mass. E. They both have the same number of electrons in their outermost orbital.