Exam 19: Evolution of the Animal Phyla

Most of the phyla of the animal kingdom are of animals that occur:

A sponge feeds itself by __________________,drawing organisms along with water into itself for nourishment.

The first animal group to show extracellular digestion was the:

Arthropods cannot grow to a very large size because they lack:

Segmentation was first apparent in the:

You went scuba diving and bring back to the lab an animal that has bilateral symmetry,a true coelom,and is a deuterostome.What animal could this be?

Trichinosis is a ________ -caused disease can be acquired by eating undercooked ________.

_______ is the field of study in which unique sequences of certain genes are used to identify clusters of related groups.

In all coelomates,the coelom originates from _________.

What is the advantage to an animal of having extracellular digestion within a gut cavity rather than intracellular digestion?

Cnidarians have two basic body forms,medusae and ________.

You are at a restaurant and order the lobster for dinner.Your son yells,"No,don't eat that ________" please!

The three distinct cell layers that form in an embryo are the ectoderm,_____________________ and ___________________.

A ____________________ is an example of a cnidarian.

An example of an echinoderm is a ______________________.

Members of which group are NOT deuterostomes?

Which phyla contains organisms divided into a head,thorax and abdomen?

The type of body cavity seen in the roundworms that develops between mesoderm and endoderm layers is a:

Cnidarians and ctenophorans differ from other metazoans by having:

Heartworm infection in dogs and cats are caused by a parasitic _____ that infests the heart of the animal.