Exam Lab (Finals) Flashcards
Invertebrates are animals that lack the?
vertebral column
Beginnings of invertebrate diversity were dated back during the?
Cambrian period
are generally soft bodied animals that lack a rigid internal skeleton for the attachment of muscles but often possess a hard outer skeleton.
invertebrates
Current data support the hypothesis that the first animals evolved from ancestors they shared with living eukaryotes known as?
choanoflagellates
Choanoflagellates share several characteristics with what phyla?
Sponges
T or F
Exciting and important fossil evidence of animal life before the Cambriancomes from the Ediacara Hills of Australia
True
It Follows sequentially in the fossil record after the Ediaracan fauna are fossils from the Cambrian Period
Cambrian Explosion
T or F
Cambrian Period fossil of Marrella splendens (black and white picture) was found in the Burgess Shale in Canada.
Truw
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.
True
Many mollusks have a free-swimming larval stage called a?
trochophore
T or F
The trochophore is also characteristic of many annelids, indicating that annelids and mollusks are closely related
True
The first human-like traits to appear in the hominin fossil record are ?
bipedal walking and smaller, blunt canines
T or F
The oldest hominins currently known are Sahelanthropus tchadensis and Orrorin tugenensis
True
The hole in the base of the skull through which the spinal cord passes
Foramen Magnon
T or F
Orrorin is known primarily from postcranial fossils, including a partial femur
True
