Exam 17: The Evolution of Animals

All chordates have ________.

A(n)________ is an example of a chordate that is not a vertebrate.

While on an archaeology expedition,you unearth a skeleton with the following characteristics: four long,slender finger bones and a smaller opposable thumb bone,long arm bones,fingernails,and eye sockets close together on a skull.What type of organism do you suspect you may have found?

Art Questions -All organisms with bilateral symmetry also have ________.

The figure below shows a simple worm.Bilateral symmetry and a highly branched gastrovascular cavity all suggest that the worm is a(n)________.

________ are characterized by stinging cells used for defense and for capturing prey.

________ are the mammalian group that lays eggs.

________ are the most diverse group of arthropods.

The lancelet is a(n)________.

The first hominid to spread beyond Africa was ________.

The platypus is a ________.

Which animals have a cylindrical body that is tapered at both ends?

Which of the following is one way in which scientists can test hypotheses about events that occurred in the distant past?

Which anthropoids are most closely related to humans?

-According to this evolutionary tree,approximately how many years ago did humans and orangutans share a common ancestor?

Insects,such as the grasshopper shown below,have ________.

Almost every element of bird anatomy is modified for what?

Scenario Questions Read the following scenario to answer the following questions. Birds are a widespread group of animals with approximately 10,000 different species found throughout the world today. Because they are relatively easy to find and so visually appealing, they have been studied more thoroughly than many other groups of animals. They are also valuable biological indicators because many species live in different habitats during different times of the year and cover long migration routes. According to the World Conservation Union, extinction threatens over 1,200 bird species today, and at least 179 are critically endangered. Some of the most endangered species include the Tahiti monarch, with only 10 pairs remaining, and the Bali starling, with only 12 wild individuals left. In Hawaii, the last captive po'ouli died in 2005, and the last two known to be alive in the wild have not been seen since 2003-2004. Common birds are also disappearing. In North America, red-winged blackbird populations declined by at least 1 percent each year between 1980 and 1999. These examples can serve as a warning. Habitat loss through destruction, degradation, and fragmentation are serious problems that affect 86 percent of threatened birds and are exacerbated by unsustainable forestry practices and intensifying agriculture. All of this shows that conservation of habitats is critical if many of the world's bird species are going to be saved from extinction in the near future. -Approximately what percent of bird species are threatened with extinction today?