Unit Test — Cumulative exam Answers

Explain how agriculture affects coral reefs.

A conservation biologist has determined the status of the ecosystems in a protected area, as shown in the table below. Based on the table, which part of the pie chart represents secondary succession?Status of ecosystemsPercentage of protected areaPrimary succession10Secondary succession30Barren land5Established community55

Explain why random distribution patterns for species are the rarest in nature.

Among humans more boys are born than girls, but women have significantly higher life expectancies. What is the significance of this?

Direct observation is the simplest and most effective method to determine population size.