Introduction to Animal Diversity Flashcards
A process which an organism undergoes transformation from young (nymph) to adult.
Metamorphosis
The larval stage is different from the adult stage
Complete metamorphosis
Young and adult stages resemble each other
Incomplete metamorphosis
A process in which cells in cell division are formed into different types of cells.
Processs where less specialized cells undergo changes to develop specialized structures and functions.
Differentiation
They determine the features of an organism. And links animals into one group.
Hox genes
involves the division of the animal through a sagittal plane, resulting in two mirror-image, right and left halves
Bilateral Symmetry
a symmetry in which the sides exhibit correspondence or regularity of parts around a central axis. It is lacking left and right sides.
Radial Symmetry
What are the germ layers of animals?
Ectoderm, Mesoderm, Endoderm
The main body cavity in many animals and is positioned to surround and contain the digestive tract and other organs.
Coelom
The clade of animals once thought to be characterized by the formation of the organism’s mouth before its anus during embryonic development.
Protostome
typically characterized by their anus forming before the mouth during embryonic development.
Deuterostomes
The outermost germ layer in animals
Ectoderm
The middle germ layer
Mesoderm
The innermost germ layer
Endoderm
an animal that has no internal, fluid-filled body cavity separating its body wall from its digestive tract.
Acoelomate
have a true coelom that arises entirely within the mesoderm germ layer and is lined by an epithelial membrane.
Eucoelomates
The time before the Cambrian period. It is believed early animal life, known as EDIACARAN BIOTA, evolved from protists at this time.
Ediacaran Period
This time marks the most rapid evolution of new animal phyla and animal diversity in Earth’s history.
most dominant animal was the TRILOBITE
Cambrian period
What percentage of air is in the atmosphere?
21% oxygen, 79% nitrogen
The period where mass extinctions have repeatedly occurred
Post-Cambrian period
What are the two mass extinctions?
Permian Mass Extinction (largest)
Cretaceous mass extinction (dinosaurs wiped out)
The study of the size, shape, and structure of animals, plants, and microorganisms and of the relationships of their constituent parts.
Morphology
