Exam 23: Animal Origins and Diversity

Which hominoid is known to have used fire for cooking meat?

The cnidarians are considered to be the sister group to which taxon?

Which organisms are hermaphroditic?

Which statement about nematocysts is true?

The _______ have bodies that are divided into two parts: a head region that bears two pairs of appendages modified to form mouthparts,and a trunk region that often has four pairs of walking legs.

Which statement about the mantle of mollusks is false?

Nautiluses are unique among living cephalopods in that they have

The calcification of an internal skeleton is characteristic of the

You go to the seafood market and buy a box of what are labeled "clams." Before cooking them,you place them in salt water and observe feathery organs that are repeatedly projected from between the two halves of the organisms' shells.You return them to the market and suggest that they be relabeled as

A major trait that distinguishes the primates from other mammals is

Wings evolved _______ in protostomes.

Cephalization is most commonly associated with

Which feature is not a characteristic of the phoronids?

A bilaterally symmetrical animal can be divided into mirror images by

A very small animal (about 0.3 mm in length)with fleshy,unjointed legs and living in marine sand is most likely a(n)

If a new fossil group of arthropods were discovered,what characteristic would most likely distinguish this group from existing arthropods?

A major change in the evolutionary lineage leading to the chordates was the

The extant species Latimeria chalumnae belongs to a group that is an important link in evolution because it was the first group of

Which taxon has the largest number of described species?

Which is a cnidarian group of geological importance because of its contributions to the formation of coral islands and atolls?