Which of the following is true according to the hypothesis on chemical evolution?
A) Early living things reproduced by linking and breaking apart at random.
B) Reproducing molecules did not originate on Earth but instead arrived from space.
C) Somewhere in the oceans, after sufficient time, a molecule formed that could copy itself.
D) Due to the effect of ultraviolet radiation, complex organic molecules that were living were formed.
C
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The extreme size of volcanoes on Mars indicates that
a. Mars has a much thicker crust than Earth. b. water once flowed in streams on Mars. c. large moving plates have not formed on Mars. d. Mars has a much thicker crust than Earth and large moving plates have not formed on Mars. e. Mars has a much thicker crust than Earth, water once flowed in streams on Mars, and large moving plates have not formed on Mars.
Which of the following best describes what we mean by the universe?
A) a vast collection of stars that number as many as the grains of sand on all the beaches on Earth B) the sum total of all matter and energy C) all the galaxies in all the superclusters D) The universe is another name for our Milky Way Galaxy.
The overall helium fusion reaction is ________
A) four helium nuclei fuse to form one oxygen nucleus B) two hydrogen nuclei fuse to form one helium nucleus C) three helium nuclei fuse to form one carbon nucleus D) two helium nuclei fuse to form one beryllium nucleus
The person who first explained the photoelectric effect was __________
Fill in the blank(s) with correct word