Stromatolites are structures created by

a. algae.
b. brachiopods.
c. sea worms.
d. trilobites.


a

Physics & Space Science

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The arrangement of permitted orbits is ____

a. the same for each neutron b. unique for each electron c. the same for all elements d. the same for all molecules e. unique for each element

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Does the Moon orbit the Sun?

A. Yes. It goes in a circle about the Sun. B. No. It orbits Earth. C. Yes, but it also orbits Earth. D. No, but it would if Earth were not present.

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Gas pressure is caused by molecular ______________ with the walls of the container

Fill in the blank(s) with correct word

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Which of these numbers is closest to the number of barbers in the US?

1.10,000 2.300 million 3.1000 4.200,000

Physics & Space Science