During puberty, an adolescent will
a. undergo growth spurts in height and weight.
b. develop primary and secondary sexual characteristics.
c. both a and b
d. neither a nor b

C is your answer, nothing fancy to it. Thanks for brainliest.

The correct answer is option c i.e. both a and b will happens.

During puberty development of primary and secondary sexual characters occur due to hormonal changes in the body. Apart from this, sudden growth of body also occurs leading to increased height and weight. During puberty, an individual prepares itself to be able to reproduce in future that's why primary and secondary sexual characters start to mature. Adolescence includes a period between 13 to 19 years.

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.