In comparison to other primates, humans' speed of growth:

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Let’s break down the question by restating what it asks and listing the options clearly.
Question: In comparison to other primates, humans' speed of growth:
Answer options:
- continues to increase in a relatively straight line from birth through adulthood
- continues to decline in a relatively straight line from birth through adulthood
- is slowest until the adolescent growth spurt
- is fastest throughout childhood

Now we evaluate each option in turn.
Option 1: 'continues to increase in a relatively straight line from birth through adulthood' This would imply a steady, unchanging rate of growth from birth all the way to adulthood. In human development, growth rate is not constant across the entire span; infants grow rapidly initially, then growth slows, and later accelerates again during puberty. Therefore this option mischaracterizes the overall growth trajectory and is unlikely to be correct.
Option 2: 'continues to decline in a relatively straight line from birth through adulthood' This would mean a continuous, uniform decrease in growth rate from birth onward. Empirically, babies grow quickly at birth and infancy, so growth rate decreases after early childhood but then rebounds during adolescence; a constant decline through adulthood does not fit human growth patterns. Thus this option is inaccurate.
Option 3: 'is slowest until the adolescent growth spurt' This reflects the general pattern that human growth is relatively gradual for much of childhood, with the most rapid acceleration occurring during puberty (the adolescent growth spurt). This description aligns with widely taught developmental biology and anthropological observations of human growth velocity, where the slowest phase precedes puberty.
Option 4: 'is fastest throughout childhood' This would claim that early childhood is the period of the fastest growth, which contradicts known growth velocity data showing rapid early infancy growth followed by a dip and then the adolescent surge. Hence this option is inconsistent with established growth patterns.

In summary, Option 1 overstates constancy of growth, Option 2 suggests a continual decline that doesn’t match the real trajectory, Option 4 wrongly asserts peak growth during childhood, and Option 3 best fits the characteristic rise in growth rate during adolescence following a relatively slower childhood period. The reasoning demonstrates why the other options do not match the typical human growth pattern, and why the described pattern in Option 3 is the best match to comparative human growth speed across development.

PSYC-312-02 Quiz Chapter 14

In comparison to other primates, humans' speed of growth:

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