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Biology
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11 Dec 2019

The implication of the living fossil designation is that these organisms have evolved very little over a very long period. Describe how this implication may or may not be accurate.

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Hubert Koch
Hubert KochLv2
13 Dec 2019
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Related questions

1.) the oldest fossil identifie so far , the stromatolites , represent which type of cell ?
A. Virus
B. Prokaryotes
C. Multicellular
D. Eukaryotes
2. A genetic change that causes a certain Hox gene to be expressed along the tip of a vertebrate limb bud instead of farther back helped make possible the evolution of a tetrapods limb. This type of change represents which of the following ?
A. Paedomorphosis
B. Heterochrony
C. A change in developmental gene or in its regulation that altered the spatial organization of body parts
D. The influence of environment on development
3. The endosymbiosis theory states the orgin of the eukaryotic cells began when
A. A mutation in prokaryotic cells led to the creation of new organelles
B. Prokaryotic cell consumed a smaller cell
C. Prokaryotic cells went extinct
D. A prokaryotic cell needed more energy and evolved a mitochondria
4. Long term trends over geological history in speciation and extinction rates can be partially explained by
A. Natural selection in small populations
B. Over harvesting by humans
C. Plate tectonics and continental drift
D. Short term changes in present day environment
5. Fossil records are important for understanding change in living organism however there are multiple limitations including ( choose all that apply )
1. Evolutionary trends in fossils may change when new fossils are found
2. Some organisms do not create fossils
3. Fossil records are biased towards certain types of species
4. Not all fossils have been found

Is it right to assume that the first living organisms on earthhad a linear genome? I base this on the fact that linearmacromolecules are clearly much more common innature that circular ones. To be honest, I can't even think ofany naturally-occurring circular macromolecules that aren't alreadya part of current living organisms.

Were the very first living organisms more likely to havelinear genomes? If so, when during evolutionary time did circularchromosomes originate?

1.All living organisms alive today are assumed to have evolved from some one-celled ancestor that lived about four billion years ago and has been called the Last Universal Common Ancestor or LUCA. LUCA has been extinct for a long time but evolutionary biologists have hypothesized as to what it was like. Given the characteristics of modern prokaryotic and eukaryotic organisms, what cellular characteristics would you suggest that LUCA had? What type of cellular respiration might LUCA have used? Why?

2. Why is water so essential for biological life? Provide examples as to how water is used in living systems.

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