ch 30 bio 2

which was the primary change animals faced adapting to life on land

the desiccating effect of the atmosphere

the common ancestor of all animals is the

choanoflagellates

the epidermis of a nematode is derived from the

ectoderm

which of the following explains why fewer animals live in freshwater than the ocean

freshwater is generally hypotonic to tissue fluids

what molecular evidence has been found in cnidarians, which have radial symmetry , thats evidence to indicate cnidarians share a common ancestor w bilateral animals

how genes

what is the key characteristic that defines the ecdysozoa clade

the animal molts

grasshoppers belong in the ecdysozoa bc of its ability to

molt

the diverse body plans seen in animilia developed during the

cambrian period

you're told that the digestive tract of the animal you're studying developed an anus before a mouth, you're looking at a

cat

your abdominal cavity which contains most of your major organs is a

coelom lined by a mesoderm

which of the following phyla is a deutrotostome

a. annelids b. molluscs c. flatworms d. arthropods [e. echinoderms]

which of the following characteristics about animals is false

animals cannot respond to stimuli

the head of an animal is known as its

anterior end

one true characteristic of all animals is that they

are heterotrophs

the first air breathing animals were

arthropods

bc its an enclosed compartment of fluid under pressure, the coelom can serve as a _, which shapes the body of short animals

hydrostatic skeleton

a marine invertebrate placed into freshwater would have difficulty surviving bc

it would have difficulty w osmoregulation

a true body cavity completely lined by a _ is called a coelom

mesoderm

the _ gives rise to muscles, bones, and the circulatory system

mesoderm

in most protostomes, the blastopore develops into the

mouth

which animal phylum has a asymmetrical body plan

porifera

if adult sponges are sessile, why can they still be classified as animals

sponge larvae are motile

which of the following are a major problem for sessile animals

they are unable to escape unfavorable environmental conditions

sponges hace specialized cells, but those cells aren't organized into

tissues

the first animals likely moved onto land how long ago

450 mya

what statement about bilateral symmetry is false

[a. Bilateral symmetry evolved in cnidarians.] b. Bilateral animals tend to have cephalization. c. Bilaterally symmetrical animals has three axes. d. Bilateral symmetry animals have a mesoderm. e. Animals with bilateral symmetry have dorsal and ventral surfaces.

which statement about the development of a coelom is false

[a. It requires animals to have either two or three tissue layers.] b. It requires the endoderm to be covered by mesoderm. c. It occurs in protostomes and deuterostomes. d. It may occur by random. e. It is a fluid-filled cavity.

which statement about echinoderms is false

a. They develop as deuterostomes. b. They fall within the group Bilateria. [c. They show evidence of segmentation.] d. The fall on the eumetazoan branch of animals. e. They fall within the group Deuterostomia.

which of the following is not an adaptation needed for living on land

a. egg shell b. internal fertilization c. skeletal system and muscles [d. external respiratory surfaces] e. embryo development within the female

which pair is incorrectly matched

a. tail end − posterior b. mesoderm − muscles [c. coelom − nο body cavity] d. deuterostomes − radial cleavage e. triploblastic − bilateral organism

diploblastic animals, such as cnidarians and _, have only 2 germ layers, ectoderm and _

ctenophores, endoderm

which group of organisms display radial cleavage during development

echinoderms

the lining of the digestive tube is formed from

endoderm

which statement best supports why animals most likely evolved in the ocean

internal fluid and salt balance was easy to maintain

what are the 2 clades of the protostomes

lophotrochozoa and endysozoa

how do protostomes differ from deuterostomes

protostomes undergo spiral cleavage during development

how is a pseudocoelom different from a coelom

a coelom is a cavity fully lined by a mesoderm