Bio Q's on Animals?

Question

1. one opening to the digestive travt is characterisitic of which of the following groups?
a. arthropods, annelids, mollisks
b. nematodes
c. cnidarians, flatworms
d. flatworms only
e. cnridarians only

2. how are primates different from all other mammals?
a. naked faces
b. ability to produce milk
c. opposable thumbs in many species
d. hairy bodies
e. placental embryonic development

3. which of the following has a 2-chambered heart?
a. amphibia
b. mammalia
c. aves
d. osteichthyes
e. reptilia

4. which of these characteristics greatly added to verebrate success on land?
a. ability to maintain a constant body temp.
b. claws
c. amniotic egg
d. 4-chambered heart
e. 2 paris of appendages

5. which of the following are the only modern animals that may have descended directly from dinosaurs?
a. snakes
b. lizards
c. crocodiles
d. mammals
e. birds

6. all are repilian characteristics except
a. keratinized skin
b. amniote egg
c. brachiaton
d. ectothermy
e. conical teeth that are relatively uniform in size

Answer 1

(1) c

(2) hmmm ... a or c - probably c

(3) d and e

(1) Single opening to digestive tract is found in some molluscs, but most worms and arthropods have mouth and anus at separate ends of an elongated digestive tract. Nematodes also have two openings. Vermicious knids like jellyfish have single opening GIT. Platyhelminthes (flatworms) have a single opening as well!

(2) Primates are monkeys/apes and man. Most mammals can produce milk. Most mammals have hairy bodies. Placental mammals have placental embryonic development (marsupials and monotremes are the exception here). Many primates have naked faces so I guess opposable thumbs would have to be it.

(3) Amphibians have 3 chambered heart. Birds and mammals have 4 chambers. Fish and reptiles have a dual chambered heart.

Answer 2

Do your own homework. You go to school to LEARN.