PLS HELP ME WITH THIS

Select the correct answer from each drop-down menu proteins are

Which scientific design has both practical limitations and limitations due to scale? studying the effect of bleach on the growth of mold spores exposing cultures of duckweed to different intensities of light observing the replication of dna molecules with a hand lens using colored marbles to model a cross between two colors of rabbits

To be or not to be that is da question