When a stellar iron core collapses, large numbers of neutrinos are formed, and then:
A) they form the neutron star.
B) they are absorbed by electrons to produce positrons.
C) they are captured to form heavy elements.
D) they are captured to form light elements.
E) they immediately pass through the core and escape to space.
Question 2
Beyond the formation of iron, nuclear energy can be produced only by:
A) fusion of still heavier elements.
B) ionization of the radioactive nuclei.
C) fission of heavy nuclei back toward lighter ones.
D) gravity.
E) the dark force.
Mutualisms, such as those that occur among plants and pollinators, generally involve large numbers o
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