in the artical "How modern life deplets our gut microbes" what organisms would be considered the "keystone"species that the artical is refuring to ? Someone please help ASAP

What is histamine and what is its role in allergic reactions

Cold case files recently began re-investigating an old murder case. the murder took place in the park; a young man, james, was hit over the head with a brick and killed. police suspected the jealous former boyfriend of james' wife, karen. whoever killed james may have washed their hands in a near-by bird bath as detectives found blood in the bird bath. since the murder took place before dna fingerprinting was available, the suspected killer, ronnie, went free. detectives are now reviewing the blood evidence using dna fingerprinting. based on the dna fingerprints of all possible suspects, who is james' killer?

What is the role of the phospholipid belayer in cellular transport in living cells