Animals Flashcards
(49 cards)
Animals are __________, and they ingest living or dead organic matter
heterotrophic
Most animals are ________, at least during some life stages
Motile
Do most animals reproduce sexually or asexually?
Sexually
Offspring pass through a series of _________ that establish a determined body plan (shape)
developmental stages
A collection of similar cells with a common embryonic origin
Tissue
External and Internal coverings
epitheliail
Blood, cartilage & bones, various functions such as transport or structural support
Connective
Contracts - locomotion + movements within the body
muscle
neutrons for rapid communication and control
nervous
Most animals undergo a layering of early tissues during _______
embryonic development
germ layer 1
diploblastic ectoderm and endoderm
dee
germ layer 2
triploblastic ectoderm, mesoderm, and endoderm
teme
in triploblasts, there is a mesoderm-derived, epithelial-lined cavity between
the digestive system and the body wall
ds and bw
in triploblasts, the mesoderm-derived, epithelial-lined cavity is usually filled with
fluid
in triploblasts, the mesoderm-derived, epithelial-lined cavity houses _________ and contains the __________
organs, circulatory system
Acoelomates have no _______ and their mesoderm region is completely filled with _________
colem, tissue
pseudocolemates are a body cavity derived partly from both ______ and _______
mesoderm and endoderm
Eucoelomates are defined as
a true coelom
animals may be __________, __________, or _________
asymmetrical, radial, or bilateral
arb
Bilaterally symmetrical, triploblastic eucoelomates can be divided into two groups based on differences in their early embryonic development
protostomes and deuterostomes
PD
Animal evolution began in the ocean over ________ years ago
600 million
there are more than ________ species of animals but there may be as many as _________
1.4, 6.8
______% of animal species are _________
95, invertabrates
informal group of animals without backbones
invertebrates