If organisms have evolved through descent with modification, as Darwin proposed,
ID: 213840 • Letter: I
Question
If organisms have evolved through descent with modification, as Darwin proposed, which of the following patterns is expected in the fossil record?
a) Taxonomic groups should be distributed randomly in time.
b) Taxonomic groups should be distributed randomly in space.
c) The most ancient fossil assemblages should include all the major groups found in modern faunas.
d) Fossils of simple organisms should appear in the geological record before fossils of complex organisms.
e) None of the alternatives are correct.
What is the waterproof skin covering of Amniote vertebrates made of?
a) Cellulose
b) Chitin
c) Keratin
d) Lignin
e) Amnion
Which of the following could be considered the most recent common ancestor of living tetrapods?
a) an armored, jawed placoderm with two pairs of appendages
b) a salamander that had legs supported by a bony skeleton but moved with the side-to-side bending typical of fishes
c) an early ray-finned fish that developed bony skeletal supports in its paired fins
d) a sturdy-finned, shallow-water lobe-fin whose appendages had skeletal supports similar to those of terrestrial vertebrates
e) None of the alternatives is correct
In what way are seed plants and reptiles similar?
a) They can reproduce without relying on water.
b) They have alternation of generations
c) They both prevent desiccation with the development stomata
d) They rely on external agents for dispersal of young.
e) All of the alternatives are correct
Explanation / Answer
1. The correct option is d) Fossils of simple organisms should appear in the geological record before fossils of complex organisms.
Fossils of simple organisms such as bacteria should appear in the geological record before fossils of complex organisms such as mammals. Mammals are more complex than bacteria.
2. The correct option is c) Keratin.
Keratin is extremely insoluble in water and organic solvents. Keratin monomers assemble into bundles to form intermediate filaments. They found in reptiles, birds, amphibians, and mammals. Waterproof skin enriched with keratin, which prevents dehydration. Reptiles have scales, made of keratin, birds have feathers made of keratin and mammals have hair and nails and horns made of keratin.
3. The correct option is d) A sturdy-finned, shallow-water lobe-fin whose appendages had skeletal supports similar to those of terrestrial vertebrates.
Lobe -fin fish belongs to the sub class crossopterygii. It is considered to be the most recent common ancestor of living tetrapod, because of the bones, which help the appendages were found to be similar to the skeletal supports found in the limbs of tetrapods.
4. The correct option is a) They can reproduce without relying on water.
Seed plants and reptiles are similar, because they can reproduce without depending upon water.
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.