At 1 year, the brain is ____ Blank percent of its adult weight.

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Question: At 1 year, the brain is ____ Blank percent of its adult weight.
Option 1: 80. This choice overestimates the brain’s early position; by age 1, the brain is typically past the half-way mark but not near full adult weight. 80% would imply a much more accelerated growth relative to standard developmental data, making this option less plausible.
Option 2: 50. This underestimates the brain’s development. By the end of the first year, the brain is already more substantial than half of its adult weight, so 50% would be too low to reflect typical growth trajectories.
Option 3: 70. This falls within commonly cited developmental ranges for brain weight relative to adult by age 1, aligning with standard references that describe substantial but not complete maturation of brain mass by this point.
Option 4: 90. This option suggests the brain is nearly at adult weight by age 1, which contradicts the well-established pattern of continued rapid growth after infancy and is therefore unlikely.
In summary, the other options either overstate or understate the known proportion of brain mass present at 1 year of age, while the 70% estimate sits closest to conventional developmental data, reflecting the typical growth stage observed at that age.

EDUC121-1AH-IN-202510-VI-81X Module 2: Quiz (Chapters 5, 6, & 7)

At 1 year, the brain is ____ Blank percent of its adult weight.

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