Among butane hydrogen and biogas which gas is environmentally friendly​

Aglow stick contains a glass vial with chemicals. when the glow stick is bent, the vial breaks and the chemicals react to produce a glow. a science student observes that a glow stick kept in the freezer glows for a longer duration than a glow stick kept at room temperature. what conclusion can be drawn based on the observation? be sure to note the outcome and test variables in the conclusion.

The number at the end of an isotope’s name is the number.

In which block of the periodic table is uranium (u) found? s blockd blockp blockf block