Which gas is being used from the atmosphere during photosynthesis? A. carbon dioxide
b. hydrogen
C. Nitrogen
D. oxygen

A. Carbon Dioxide

Hope this helps :)

Antibiotic resistance happens naturally due to genetic mutation through random selection, however, genetic drift occurs on purpose and tests which genes are stronger and should continue to be passed on to future generations. In most cases, genetic drift is needed and antibiotic resistance isn’t.