Why do we think tiny quantum ripples should have been present in the very early universe?

Curious carl calculated the density of a cube to be 4.50 g/cm3. what is the density of the cube in g/l?

Which of the following is not a part of the respiratory system? a. pharynx b. trachea c. pancreas d. larynx

Which best describes the first law of thermodynamics as compared to the second law of thermodynamics? a. the first law describes how thermal energy is conserved but not the direction it moves. b. the first law describes the direction thermal energy moves but not how it is conserved. c. the first law describes how thermal energy can be created but not how it can be destroyed. d. the first law describes how thermal energy can be destroyed but not how it can be created.