Exam 17: The Evolution of Animals

The process of biological evolution often allows humans to survive consistent environmental stresses that occur across multiple generations.As humans colonized Earth's diverse environments,they encountered hot,dry areas and decided to settle.What trait likely offered an advantage in this environment?

What characteristic is unique to echinoderms?

Unique features of vertebrates include the presence of a(n)________.

A(n)________ is an example of a mollusc that does not have a shell.

Which of the following is a characteristic of all chordates?

Among vertebrates,the unique feature of lampreys and hagfish is the ________.

A feature that freed reptiles from dependence on water for reproduction is ________.

J)R.R.Tolkien is a famous author who wrote,among others,several books about the adventures of a community of a humanoid (meaning resembling a human)race.The individuals of this race are described by Tolkien as being "…between 2 and 4 feet (0.61-1.22 m)tall,the average height being 3 feet 6 inches (1.07 m)… a fairly human figure." This general description characterizes the humanoids mostly closely resembling ________.

The mobile stage of the cnidarian life cycle is the ________ stage.

What name is given to the food-trapping cells of sponges?

Which group of fishes includes a lineage that migrated out of fresh water and adapted to life on land?

You are given the task of confirming the categorization of a newly discovered animal that has been tagged as a species of annelid.What evidence would convince you that it is indeed an annelid and not a roundworm or flatworm?

Art Questions -According to the figure,which organism group demonstrates the most advanced body plan in reference to presence of tissue and symmetry?

Where did humans first appear?

At a natural history museum,you see a skeleton with the following characteristics: four long,slender finger bones and a smaller opposable thumb bone,and larger feet with long toes.In what type of environment would you expect this organism to have lived?

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. -What is the greatest threat to birds today?

Which of these is a defining characteristic of animals that distinguishes them from other eukaryotes?

Swim bladders ________.

A feature unique to mammals includes ________.

A characteristic of arthropods that has allowed for their great success is the presence of ________.