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