What conclusion can you draw from the data? a. all rhizobium strains have a similar, highly positive effect on plant growth. b. some rhizobium strains are much more effective at promoting plant growth than other strains; the most ineffective strains have little positive effect. c. some rhizobium strains are much more effective at promoting plant growth than other strains; however, even the most ineffective strains have a significant positive effect. d. none of the rhizobium strains used in the study have a substantial positive effect in promoting plant growth.

Rhizobium is a bacterium that has positive effects on plant growth. Different strains display a wide range of effectiveness, from a little positive effect to a massive one. The strains used in the study did not show a positive effect promoting plant growth, so we could say that they ARE NOT Rhizobium strains and need to be properly identified.

Explanation:

•there must be variation for the particular trait within a population.

•the variation must be inheritable (that is, it must be capable of being passed on from the parents to their offspring).

•individuals with one version of the trait must produce more offspring than those with a different version of the trait.good

explanation:

if someone had the list of traits you provided