(Plz help ASAP) List at least three different sources used for naming organisms

What’s the percent by mass of carbon in c10h14n2

Asa choose the correct set of reaction coefficients to properly balance the following chemical equation according to the law of conservation of mass: __s8 + __o2 ==> __so2 1, 1, 8 1, 8, 1 1, 8, 8 8, 1, 1

Structure of the atoms: discovery of the nucleus in 1909i need answering all of these questions