If an organism's fossil was found in the Mississippian era and a different organism fossil in the Devonian era, which organism would you say roamed the Earth first, the one in the Mississippian or the one in the Devonian? How do you know? Two part question i need the answer as soon as possible its urgent!

For the reaction, 4 a(g) + 3 b(g) => 2 c(g), the following data were obtained at constant temperature. experiment initial[a],mol/l initial [b],mol/l initial rate,m/min 1 0.200 0.150 5.00 2 0.400 0.150 10.0 3 0.200 0.300 10.0 4 0.400 0.300 20.0 which of the following is the correct rate law for the reaction? 1. rate = k[a]2[b]2 2. rate = k[a][b] 3. rate = k[a]2[b] 4. rate = k[a][b]2

How is the atomic number of a nucleus changed by alpha decay

20 pts ‼️ an unmanned spacecraft travels to mars. mars has a lower strength of gravity than earth. where in the image is the spacecraft’s weight the greatest?