Determine where the function is concave upward. 
Definitions:
Growth Spurt
A growth spurt refers to a rapid increase in height and weight that typically occurs during puberty.
Sex Hormones
Chemical substances produced predominantly by the ovaries and testes that regulate secondary sexual characteristics and reproductive functions.
Puberty
A phase of development in which a child's body becomes capable of reproduction, marked by physical changes and hormonal fluctuations.
Ossification
Ossification is the process by which bone forms, replacing soft tissues with bony tissue during growth or healing.
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