Which of the following is most likely to be a secondary pollutant? a. ozone b. lead c. carbon monoxide d. particulate matter

When analyzing tree rings, what do scientists assume a thin ring indicates?

Crossing over and independent assortment are important activities that occur during meiosis. what is the significance of these activities

Use the phylogenetic tree to the right to determine which statement below is true. organisms a and f are not related. organism e is more closely related to organism b than organism f. organisms c and d are more closely related than organisms a and b. phylogenetic trees