write down the subshell from which an electron would have to be removed to make a cation, and the subshell to which an electron would have to be added to make a anion. Ga K

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Order of filling levels and sublevels of electrons: 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p⁶6s²3f¹⁴5d¹⁰6p⁶for an element with 5 electrons in the 3d energy level: full configuration: 1s²2s²2p⁶3s²3p³.

Combustion is the act or process of burning. therefore, i believe the answer is  a: burning wood. 

As long as you're breathing, you'll be fine : /p. s. if you aren't breathing, you'll pass out. mark as brainliest.