When antibiotics were first developed in the 1940s, most bacterial diseases could be controlled by them. Today, the diversity of bacteria is increasing, and many bacteria are now resistant to many antibiotics. One possible explanation for this change is that -

gametes or germ cells are haploid cells (example: sperm and ova) containing only one set (or n) number of chromosomes and autosomal or somatic cells are diploid cells containing 2n number of chromosomes.

i would say it is

only about ten percent of the energy at one trophic level is passed on to organisms at the next trophic level. the remainder of the energy is used in life processes or lost as heat.

"it built up in the atmosphere"

i think thats it, idk, i tried looking for this exact q& a for grad. and idk if i got this question right or sorry if im wrong