Linked Questions

1 vote
0 answers
2k views

Why don't all organisms reproduce asexually?

According to a comment at Why are not all species hermaphrodites?, asexually reproducing species go extinct more easily. However, I don't think sexual reproduction is a true evolutionary stable ...
Timothy's user avatar
  • 886
1 vote
0 answers
36 views

Are there any biological obstacles prohibiting lighter-than-air organisms? [duplicate]

Why there are no organisms that use cavities filled with lighter-than air substances (e.g. hydrogen) to fly and remain in air? Given that there are a lot of fish and algae that use similar cavities ...
Anixx's user avatar
  • 3,016
1 vote
0 answers
321 views

Monocot stele in roots

Why do monocots have eustele in the roots instead of protostele like dicots? I thought the roots don't need the strength of eustele because the roots are supported by the soil. So what is the ...
TanMath's user avatar
  • 3,079
0 votes
0 answers
17 views

What prevented invertebrates from discovering flight a second time? [duplicate]

Vertebrates evolved powered flight three times in history, being pterosaurs, birds, and finally, bats. Invertebrates were the first to evolve flight on the planet... but flying insects remained the ...
Darth Biomech's user avatar
0 votes
0 answers
24 views

How long does it take for a creature to adapt for a different diet?

For the sake of the question, let's say that a population of piscivorous birds are put in a Europe-sized box. Half of the box is sea, populated with their diet of fish and crabs and cephalopods, and ...
Craig Morrison's user avatar
0 votes
0 answers
26 views

Visibility of a spiders web from a distance

Given that the diameter of a spiders web is, for instance, far smaller than a thread of cotton. Why are spiders' webs so visible from a distance? What property of spiders' webs makes them so obvious (...
3-14159265358979323846264's user avatar
0 votes
0 answers
59 views

Why DNA polymerases don't have helicase activity

RNA polymerases have intrinsic helicase ability, while DNA polymerases don't. I am curious why DNA polymerases evolved in such a way that they lack the ability to unwind DNA.
Son of Sevenless's user avatar
0 votes
0 answers
48 views

What is evolutionary advantage of Spirogyra to be multicell?

Spirogyra is just a set of cells connected to each other; it has no leaves, roots, etc... It even doesn't have multiple layers of cells like Hydra. So what is evolutionary advantage for Spirogyra ...
Vitalii's user avatar
  • 101
0 votes
0 answers
79 views

Is the human mouth more burn-resistant than other animals which don't eat cooked food?

I burnt my mouth on some hot pizza and it got me wondering if we have been eating cooked food long enough to have evolved a better resistance to oral burns than other species. Have there been any ...
Adam Kabbeke's user avatar
0 votes
0 answers
67 views

Why did the dinosaurs not have gigantic brains and become really smart? [duplicate]

All my life, I've heard that all these gigantic dinosaurs that used to live on Earth had peanut-sized brains. I just accepted this as a fact, and I guess it may be a fact. But now I wonder: why?! If ...
Z. B.'s user avatar
  • 21
0 votes
0 answers
31 views

What are evolutionary reasons for humans' limited regeneration abilities? [duplicate]

As far as I understand (I am not a biologist), a ability of a species arises during the evolution if: It increases reproduction chances It is not too energy expensive It is physically possible At ...
kandi's user avatar
  • 109
0 votes
0 answers
31 views

Evolutionary explanation for hypoxia causing euphoria? [duplicate]

Why would something potentially very dangerous, such as hypoxia induce something pleasurable like euphoria? Are there any evolutionary hypotheses for this link? I'm thinking that something like the "...
got trolled too much this week's user avatar
0 votes
0 answers
23 views

Are the 5 digits of all land vertebrates an accidental number? [duplicate]

All land verterbrates except some frogs have 5 fingers on hands and feet. The first vertebrate lizards came out of the water and had 7 fingers ( -370mn yrs), and then 6 fingers, and after 30 million ...
bandybabboon's user avatar
  • 10.4k
0 votes
0 answers
128 views

Is there an evolutionary advantage associated with migraine? [duplicate]

I have read Wikipedia article on Genetics of migraine headaches and I don't buy it Because genetics influence susceptibility to migraine, it can be shaped by evolution. Fitness-impairing ...
Matas Vaitkevicius's user avatar
-1 votes
0 answers
8 views

Why some receptors have such high activation ceilings? [duplicate]

Why does the brain have receptors that have such a high activation celling, that no endogenous neurotransmitter could even come close to fully activate? Which ultimately results in there being certain ...
Antony Theo.'s user avatar

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