Control rods are inserted into a nuclear reactor when you want the nuclear reaction rate to ________.
Fill in the blank(s) with the appropriate word(s).
slow down
decrease
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The cell theory states that all organisms consist of one or more cells, the cell is the basic unit of life, and all cells arise from existing cells. This is a scientific theory. How could the cell theory be disproven?
What will be an ideal response?
Which of the following methods describes the transit method for detecting extrasolar planets?
A) regular changes in the positions of the parent stars with respect to more distant stars as they move across the sky B) detection of Doppler shifts in the spectra of the parent stars C) detection of brightness changes in a star as a planet passes in front of it D) detection of reflected starlight
Our Sun is a first-generation star.
a. true b. false
Rain or snow that falls on the continents is Earth's only
A) supply of water. B) supply of fresh water. C) hydrologic cycle. D) source of evaporation and condensation.