What is not necessary for all living organisms on Earth to survive?

A) energy
B) nutrients
C) oxygen
D) liquid water


C) oxygen

Physics & Space Science

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The constant K in Kepler's Third Law is the same for all the planets in our solar system, but is different for planetary systems orbiting other stars

Indicate whether the statement is true or false

Physics & Space Science

For the Pleiades, a fifty-million-year-old cluster, we find classes ________ and ________ already leaving the main sequence, making the seven bright giants in the "seven sisters."

Fill in the blank(s) with correct word

Physics & Space Science

A Young's double slit has a slit separation of 2.50 × 10^-5 m on which a monochromatic light beam is directed. The resultant bright fringes on a screen 1.00 m from the double slit are separated by 2.30 × 10^-2 m. What is the wavelength of this beam? (1 nm = 10-9 m)

a. 575 nm c. 373 nm b. 454 nm d. 667 nm

Physics & Space Science

Nuclear Reactions: In the nuclear reaction O + n ? X + He, what is X?

A. 12C B. 13C C. 14C D. 15C E. 17O

Physics & Space Science