Exam 17: The Evolution of Animals

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

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?

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

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

Almost every element of bird anatomy is modified for what?

Which anthropoids are most closely related to humans?

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

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?

What type of symmetry does this organism exhibit?

________ are the most diverse group of arthropods.

________ are the mammalian group that lays eggs.

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

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

The lancelet is a(n)________.

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

The platypus is a ________.

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

A characteristic that is shared by snakes and birds is ________.