Animal Characteristic (8.7) Flashcards
About 800 MYA (in the Pre-Cambrian Era) multicellular animals evolved from the ______ kingdom.
protist
They would have evolved from a group of ____-_______
protists.
multi-cellular
About 360 MYA animals (_____) begin to colonize land.
fish
About 250 MYA Pangaea forms causing mass extinctions of _____ and ________. (Reptiles survive dry climate.)
fish, amphibians
About 180 MYA _______ breaks apart.
Pangaea
About 65 MYA an asteroid collides with Earth causing mass extinction of __________/_________. (Mammals survive)
reptiles/dinosaurs
Animals traits
Multi-cellular heterotrophs by ingestion
Have no cell walls
Most have muscle and nervous tissue for movement and responding to a changing environment
Exhibit diploid dominant life-styles
(Reproduce sexually using flagellated sperms and non motile eggs that are haploid. Gametes fuse together to make diploid zygote. The zygote will continue to grow, by mitosis, and develop into the organism)
Multi-cellular heterotrophs by ________
ingestion
Do animals have cell walls?
no
They have _____ and ______ tissue for movement and responding to a changing environment
muscle and nervous
Exhibit ______ dominant life-styles
diploid
They reproduce _________
sexually
Gametes fuse together to make a _______ ________.
diploid zygote
like animals
Parazoa
true animals
Eumetazoa
______ are asymmetrical, have no true tissues, and are non-motile but are heterotrophic
Parazoa