Asample of sno2 has a mass of 23.2 g. the masses of sn and in the sample are link to periodic table of the elements 11.6 g of sn and 11.6 g of o 7.7 g of sn and 15.5g of o 20.4 g of sn and 2.8 g of o 18.3 g sn and 4930

Which answer tells the reason the earth’s climate is getting warmer? too many animals are becoming extinct. large glaciers are melting in antarctica. the earth is moving closer to the sun. driving cars gives off gases that trap heat in the atmosphere.

One student said that the investigation was not valid (a fair test). write a plan for the investigation that includes improvements to the method and apparatus

The independent variable in an experiment will be the variable that you o a) change ob) hold constant ng c) observe for changes