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Application of Skills
Directions: Apply the knowledge you have gained from Chapter 7 to select the best answer to the questions about the following reading passage.
1The first primates arose between 85 million and 65 million years ago, in tropical Paleocene forests. By the Eocene, the primates were living higher in the trees. They now had a shorter snout, a larger brain, better daytime vision, and better ways to grasp and manipulate objects. How did these traits evolve?
2Trees offered food and safety from ground-dwelling predators. There also were zones of uncompromising selection. Picture an Eocene morning, leaves swaying in the breeze, colorful fruit, and predatory birds. An odor-sensitive, long snout would not have been useful; breezes disperse odors. A brain that assessed motion, depth, shape, and color, along with skeletal changes, must have been favored. For example, eye sockets became positioned in front instead of on the sides of the skull-a better arrangement for depth perception.
-adapted from Starr, Biology: Concepts and Applications , p. 395
The sentences in the passage are
Odors
Volatile substances that are perceived by the olfactory system, leading to the sense of smell.
Proximate Cause
The immediate, primary reason for an event or condition, often discussed in legal and biological contexts.
Day Length
The duration of daylight hours in a 24-hour period, which varies depending on the season and geographical location.
Animal Migration
The movement of groups of animals from one location to another, often seasonally, in response to changing environmental conditions.
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