how many times did chitin evolve?
Homework Answers
This is about homoplasies. An homoplasy is a evolutionary trait that doesn't have a unique ancestor that developed it, it means it appeared more than one time in history developed by different organisms. Let's start analyzing.
Chitin is present in 2 Kingdoms, Animalia and Fungi. The whole Fungi Kingdom has the chitin cell walls, they have a common origin for that, but the chitin in animalia is not from that same origin. Now, in animalia the Phyla Arthropoda, Mollusca and Chordata. Even though Arthropoda and Mollusca are not farly related they don't share a common ancestor. So chitin evolved 3 times, one for mushrooms, one for arthropods, and for mollusks and one for some chordates (some fish)
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Number 55
change for the surrounding was 500 J/K, by how many times did the A. 50 times vluie l u D. 25 times B. 1500 units C. 15.0 times ??@ 0 55 Calculate the standard absolute entropy, in J/mol K, of Mg: calculate the standard abselute entropy, in Jlimol H, 2NO,(g) + 2Mgo(s) Mg(NO(s)+Mg(AS-462.1 J/K S°(MgO)- 27.0 J/mol K S°(Mg(NO,))- 39.2 /mol K SO(NO)- 239.9 J/mol K A. 32.5 Calculate ASo for the following re?ction: C. 27.8 D. 0.00...
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At which point on the phylogenetic tree shown above did aiborne
spores evolve?
At which point on the phylogenetic tree shown above did
alternation of generations evolve?
At which point on the phylogenetic tree shown above did dominant
sporophyte generation evolve?
At which point on the phylogenetic tree shown above did flowers
evolve?
At which point on the phylogenetic tree shown above did seeds
evolve?
8 Angiosperms Gymnosperms Ferns and Horsetails Lycophytes Hornworts Mosses Liverworts Coleochaete and Chara
Number 55
change for the surrounding was 500 J/K, by how many times did the A. 50 times vluie l u D. 25 times B. 1500 units C. 15.0 times ??@ 0 55 Calculate the standard absolute entropy, in J/mol K, of Mg: calculate the standard abselute entropy, in Jlimol H, 2NO,(g) + 2Mgo(s) Mg(NO(s)+Mg(AS-462.1 J/K S°(MgO)- 27.0 J/mol K S°(Mg(NO,))- 39.2 /mol K SO(NO)- 239.9 J/mol K A. 32.5 Calculate ASo for the following re?ction: C. 27.8 D. 0.00...
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