Final answer:
A secondary tropical forest is a forest that has regrown after human activity, while a primary forest is an undisturbed forest. Secondary forests are generally less diverse and have fewer species compared to primary forests.
Step-by-step explanation:
A secondary tropical forest refers to a forest that has regrown after being disturbed or cleared, usually as a result of human activity such as logging or agriculture. It is different from a primary forest, which is an undisturbed forest that has never been significantly altered by human activity. Secondary forests are generally less diverse and have fewer species compared to primary forests, but they can still support a variety of flora and fauna.