Every year, gray whales migrate from feeding grounds in the Gulf of Alaska to breeding grounds off the coast of Mexico. Marine biologists are especially interested in monitoring the population of 'resident' gray whales off the Oregon Coast who skip this journey and instead spend much of the time in cooler waters. Whales have distinct markings on their flukes (i.e. tails) that can be used to identify individuals. Researchers catalog 23 unique flukes during the first week of May. During June, they resample the same area and find 39 total whales, of which 5 were already cataloged. Using the mark-recapture method, how many resident whales make up this resident population? Record your answer to the nearest whole number.

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Primate evolution

Primates are a relatively new species and first appeared in the fossil record nearly 55 million years ago. They may have originated as far back as the cretaceous period. Their fossils were observed in North America, Asia, and Europe. Long before the first monkeys and their prosimian relatives developed, most animal species thrived and died. The first primates did not exist until about 50-55 million years ago, even though the planet is 4.54 billion years old and the first life goes back at least 3.5 billion years. Dinosaurs had been extinct for 10 to 15 million years when this happened.