Exam 17: The Evolution of Animals

What characteristic is unique to echinoderms?

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

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

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

Approximately what percent of bird species are threatened with extinction today?

The common ancestor of all animals is likely to have been a ________.

There are more species of ________ than of any other type of animal.

The segmented body of the worm below suggests that it is a(n)________.

The arthropod skeleton is composed of ________.

Which of the following is a characteristic of all chordates?

What is a feature of birds that makes them valuable as biological indicators?

Humans are chordates.Which animal group is most closely related to chordates?

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 ________.

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

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?

How do New World monkeys differ from Old World monkeys?

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?

A feature unique to mammals includes ________.

The first hominid to spread beyond Africa was ________.

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