Based on the data below, which of the following statements best describes an effect of population density on mice populations: Number of Ave. Ave. Ratio of percent of successful mice number of male: mice per female breeding litter 50 60% 7.2 1:2 148 58% 6.8 1:2 374 57% 6.6 1:2 1700 39% 5.2 1:2 O a. Successful breeding decrease as population density decreases. O b. the female to male ratio increases a population density decreases O c. Successful breeding decrease as population density increases O d. Birthrate decreases as population density increases

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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.