The pattern of spacing between individuals across the range of a population is its a )growth rate b)distribution c)density d)habitat

it is D, distribution

Species distribution is the way in which a biological taxon is spatially resolved. The geographic limits of a particular taxon's distribution are its range, often described as shaded areas on a map. Patterns of distribution shift depending on the scale at which they are observed, from the arrangement of individuals within a small family unit to designs within a population, or the distribution of the entire species as a whole (range).

answer: - b cells

explanation: -

so, the b cells mediate their action by identifying the antigens present on the surface of the pathogens and then producing antibodies in return to mediate its effect.