Question

the graph shows __ selection. if it showed a change from medium birth weight babies being the majority to only low birth weight babies being the majority, this would be __ selection.
the environment selects for a very narrow range of phenotypes.
number of babies
low high
human birth weight
infographic 13.8
biology for a changing world, fourth edition
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directional; stabilizing
stabilizing; directional
diversifying; stabilizing
diversifying; directional
directional; diversifying

Explanation:

The graph shows stabilizing selection because it narrows the phenotype range (favors medium birth weight, reducing extremes). A shift from medium to only low birth weight is directional selection, as it moves the population toward one extreme phenotype.

Answer:

stabilizing; directional