Exam Lab (Finals)

Question 1

Invertebrates are animals that lack the?

Answer 1

vertebral column

Question 2

Beginnings of invertebrate diversity were dated back during the?

Answer 2

Cambrian period

Question 3

are generally soft bodied animals that lack a rigid internal skeleton for the attachment of muscles but often possess a hard outer skeleton.

Answer 3

invertebrates

Question 4

Current data support the hypothesis that the first animals evolved from ancestors they shared with living eukaryotes known as?

Answer 4

choanoflagellates

Question 5

Choanoflagellates share several characteristics with what phyla?

Answer 5

Sponges

Question 6

T or F
Exciting and important fossil evidence of animal life before the Cambriancomes from the Ediacara Hills of Australia

Answer 6

True

Question 7

It Follows sequentially in the fossil record after the Ediaracan fauna are fossils from the Cambrian Period

Answer 7

Cambrian Explosion

Question 8

T or F
Cambrian Period fossil of Marrella splendens (black and white picture) was found in the Burgess Shale in Canada.

Answer 8

Truw

Question 9

T or F
Cladogram of Invertebrates: based on similarities and differences shared among groups, also indicates the sequence in which some important features evolved. These features include body symmetry, cephalization, segmentation, and formation of a coelom. Many of these features evolved in Cambrian animals.

Answer 9

True

Question 10

Many mollusks have a free-swimming larval stage called a?

Answer 10

trochophore

Question 11

T or F
The trochophore is also characteristic of many annelids, indicating that annelids and mollusks are closely related

Answer 11

True

Question 12

The first human-like traits to appear in the hominin fossil record are ?

Answer 12

bipedal walking and smaller, blunt canines

Question 13

T or F
The oldest hominins currently known are Sahelanthropus tchadensis and Orrorin tugenensis

Answer 13

True

Question 14

The hole in the base of the skull through which the spinal cord passes

Answer 14

Foramen Magnon

Question 15

T or F
Orrorin is known primarily from postcranial fossils, including a partial femur

Answer 15

True

Question 16

T or F
The distal portion of the femur shows similarities to those of modern humans, suggesting the species was bipedal

Answer 16

False: proximal

Question 17

T or F
In both Orrorin and Sahelanthropus the canine teeth of males are larger and more pointed than in modern humans but are small and blunt compared to the canines of male apes

Answer 17

True

Question 18

T or F
By far the best known early hominin is Ardipithecus ramidus

Answer 18

True

Question 19

T or F
The skull of Ardipethicus ramidus is rather ape-like and broadly similar to that of Sahelanthropus, with a small chimpanzee-sized brain of 300–350cc.

Answer 19

True