Which of the following is an example of mutualism? (1 point)

a)bacteria live in root nodules of a plant, processing nitrogen into ammonia for the plant and receiving protection and a steady food supply in return.(my answer)
b)moss benefits from exposure to light and moisture as it grows on a tree trunk that is not affected by its presence.
c)fleas live in the fur of a dog where they periodically pierce the dog’s skin and feed on its blood.
d)cowbirds lay their eggs in the nests of other birds that are often tricked into rearing the cowbird chicks instead of their biological chicks.

Which conditions are necessary for natural selection to occur? select all of the answers that apply. a. inheritable adaptations vary among individuals. b. the population size is increasing. c. more individuals are born than can survive. d. fitness varies among individuals. e. the environment changes suddenly and drastically.

Which codon is the code for the amino acid histidine (his)?

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?