Type II supernovae are believed to occur when the cores of massive stars collapse
a. True
b. False
Indicate whether the statement is true or false
True
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Which of the following is true of natural selection?
A) It is a random occurrence. B) It does not occur in most species of organisms. C) It is directed by changes in the environment. D) It does not lead to evolution of a species.
A convex mirror has
A) no focal length. B) a positive or negative focal length depending on the object position. C) a positive focal length. D) a negative focal length. E) a positive or negative focal length depending on the object size.
Dark energy was discovered as astronomers studied
A) black holes. B) the motion of galaxies within galactic clusters. C) redshift of distant galaxies. D) weakly interacting massive particles.
Which of the following polymer combinations is least likely to mix?
(a) Liquids of two different long-chain molecules with a positive enthalpy of mixing. (b) A liquid solvent and solid polymer with solubility parameters of 19 MPa0.5 and 20 MPa0.5, respectively. (c) Liquids of two different long-chain molecules with a negative enthalpy of mixing. (d) Liquids of two different short molecules with a positive enthalpy of mixing.