Sarah wants to know how many iguanas live on the island of St. Thomas. She sets up
traps for them, and in the initial trapping event, she captures and marks 42 iguanas.
Three months later, she sets out traps again and this time she captures 35 iguanas, 9
of which had the mark. What is the population size of iguanas on St. Thomas?

measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.

the correct answer to this question is #5