One reason that bacteria can be harmful is that they: a. can remove nitrogen gas from the air. b. have cell walls with peptidoglycan. c. can produce toxins that kill other cells. d. live in the digestive tracts of animals.

What if the yeast were extremely active and produced more than 100ml gas. would you know? why/why not

14) whenever diploid populations are in hardy-weinberg equilibrium at a particular locus a) the allele's frequency should not change from one generation to the next, but its representation in homozygous and heterozygous genotypes may change. b) natural selection, gene flow, and genetic drift are acting equally to change an allele's frequency. c) this means that, at this locus, two alleles are present in equal proportions. d) the population itself is not evolving, but individuals within the population may be evolving.

20 how are energy cycles and growth cycles related?