What country first noticed that the stars move across the sky?

Which of the following statements is true about planck’s law

Which of the following ocean acidification? are the most likely side effects of a ph less than 7.0 in the ocean b. more metal salts altering the ocean chemistry c. dissolution of the shells of marine organisms d. both a & b e. all of the above.

Which of the following units is not an official si unit? mole liter kilogram ampere