What occurs to the electromagnetic radiation from the sun enters earths atmosphere

All cells are made of four types of acids, lipids, proteins, and carbohydrates.

1) which of the following is the best example of a physical change? a) sugar dissolving in tea b) firefly glowing 2) in the combustion of ethane, what is/are the reactants? c2h6 + o2 ==> co2 + h2o a) c2h6 and o2 b) co2 and c2h6

Is 343 in the sequence -5, -2, 1, 4, 7