what would be the result of a mutation that deactivates the regulatory gene of a repressible operon in an escherichia coli cell?

if your own plato the answer is b. the fern transitioned from sporophyte generation to gametophyte generation.

burning fossil fouls really decrease the carbon in the atmosphere so b

not necessarily. higher fitness requires the organism to be reproductive successful. for example, an organism at age 10 with 15 offspring is much more fit than an organism at age 15 with only 5 offspring.