Bio103 Invertebrate evolution

mantle over body mass

T/F In most animal species, the gametes are the only haploid cells in the life cycle.

Cephalization

Which organism has no body cavity?

All organisms in the kingdom Animalia are multicellular heterotrophs without cell walls.

An acoelomate is an animal that has

The body cavities of coelomates are located entirely within the ectoderm.

An animal that has a body cavity completely lined with mesoderm is called a(n)

In some animals, ganglia at the anterior end of the animal serve as a primitive

When a round worm causes severe swelling of a person's limbs, the person has

simplest organ systems

An animal with definite right and left sides has

T/F Without exception, all animals are heterotrophs

if an animal has a digestive tract, an open circulatory system, and an exoskeleton

Which diagram shows an organism that probably has a circulatory system?

Animal X - no coelom or cephalization. It is a(n)

Sponges show

nematocyst producers

segmented worms

Which of the following is a germ layer present during animal development?

One difference between a gastrovascular cavity and a digestive tract is that

The acoelomate body type is exemplified by

T/F Most radially symmetric animals are aquatic.

The classification of animal as a deuterostome or a protostome is based on

Which of the following invertebrates are deuterostomes?

complete gut and pseudocoelom

An animal that has a body cavity completely lined with mesoderm is called a(n).

Digestion functions as a mechanism for

jointed exoskeleton

A gastrovascular cavity is a digestive tract with two openings.

Hermaphroditic animals reproduce asexually.

An exoskeleton acts in the same way as a hydrostatic skeleton.

Which of the following does not describe animals?

tube feet, spiny skin

T/F Gametes are necessary for successful sexual reproduction.

Humans have a body plan similar to which letter?

In a protostome the blastopore becomes a(n)

one way to distinguish a round worm from an annelid is to

Single celled organisms and sponges digest food within their body cells.

A closed circulatory system keeps blood in vessels all the time.

simplest known animal

Animal Y - has 3 germ layers, bilateral symmetry, but no coelom. It is a(n)

A body cavity that forms between the germ layers is called a(n)

Organism B is a(n)

Which phylum includes the most species?

T/F The majority of animal species are classified as invertebrates

the excretory organ of the planarian __.