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Why protist are not metazoans
Protist are primarily unicellular organism
Challenges animals face in marine habitats
Climate change, pollution, and habitat loss
Challenges animals face in freshwater habitats
Unstable, changes occur often, smaller so influenced by extrinsic environmental factors
Challenges animals face in terrestrial habitats
Extreme temperature and water balance
What is used to construct phylogenetic trees
morphological (body shape), biochemical, behavioral, or molecular features of species or other groups. Then grouped by relationships among them
Protostomia
Have mouth forming first
Deuterostomia
Anus forming first
Spiralia
Undergo spiral cleavage
Ecdysozoa
All capable of molting
Echinodermata
5 radial symmetry
Hemichordata
Worm-like body, bilaterally symmetry and triploblastic in nature
Chordata
notochord and post anal tail
Saxitoxins
neurotoxins that cause paralytic shellfish poisoning
ribotoxins
fungal ribonuclease
Cephalization
Concentration of nerve tissue and sensory organs at the anterior end of an animal, creating a head region. ( encounter head first) Bilateral symmetry.
ex: Birds, snakes, lobsters, ants
Radial cleavage
Simple pattern of cell division that occurs in early embryonic development
Spiral cleavage
pattern of cell division that occur in flat and earthworm, snail
Acoelomate
organisms that have no true body cavities between the layers of their tissues
Pseudocoelomate
they have a body cavity, but it is not lined with mesoderm.
Eucoelomate
true body cavity