Animal Diversity Flashcards
(22 cards)
The largest mass extinction occurred at the end of the ______ period, and facilitated the rise of the dinosaurs.
Permian
A dominant species during the Cambrian period was the _______.
Trilobite
Most scientists generally hold that animal life appeared during the _______period.
Ediacaran
Animals are primarily classified based on _______.
morphological and developmental features.
rRNA data has reclassified the ________ as a type of protostome.
lophophorates
True animals are next divided into clades based on _______.
body symmetry
Aquatic bilateral animals often have a _________ shape to reduce drag.
fusiform
Animals that conserve heat to maintain a relatively stable body temperature are _______.
endotherms
The __________ change from bilateral to radial symmetry over the course of their life cycles.
Echinodermata
Nervous tissue is specialized to send and receive _______.
electrical signals
________ connective tissue has a consistency similar to a cotton ball pulled apart.
areolar
_________ epithelial cells fit together to form a covering or lining.
squamous
________ have specialized cells, but these cells are not organized into tissues.
Parazoa
__________ muscle is composed of cells with a single, centrally located nucleus and has striations.
Cardiac
Animals that undergo _________ metamorphosis appear quite different in larval and adult forms
complete
The __________ have a mosoderm region completely filled with tissue
acoelomates
Hox gemes are responsible for determining the ______ of animals.
general body plan
Endotherms use their _______ to help maintain body temperature
circulatory system
A homeostatic response that changes the direction of a stimulus is a _________
negative feedback loop
Due to the impact of heat on ________, it is essential for organisms to have some form of thermoregulation
proteins
Physiological systems within the body are adjusted by _________.
homeostatic regulation
