Linked Questions

5
votes
3answers
1k views

Why do ostriches have wings? [duplicate]

Wings serve most birds for flying, or (as in penguins) for swimming. But ostriches, which exclusively use only their legs for locomotion, still have wings. Why?
0
votes
1answer
2k views

Why do humans have 46 chromosomes? [duplicate]

Humans have approximately 25000 genes. Why are these genes on 46 chromosomes? Why not 40 or 50?
3
votes
2answers
964 views

Why were wisdom teeth not eliminated by evolution? [duplicate]

Supposedly evolution was very efficient and evolved many human proteins over a few thousand generations. Yet obvious detrimental traits like wisdom teeth remained. Why?
-1
votes
2answers
520 views

Why haven't humans evolved to fly? [duplicate]

Why haven't we evolved the ability to fly? I mean, it is advantageous when you take into account how many predators and parasites exist on the land, and there may be less or no dangers from birds up ...
4
votes
1answer
388 views

Bacteria resistance to natural antibiotics? [duplicate]

It is a known fact that bacteria develop immunity to antibiotics. Why then did not all bacteria develop immunity to natural antibiotics like penicillin in the fungi? It is for sure that fungi did not ...
0
votes
2answers
180 views

In men, why do over 80% of sperm have abnormal form? [duplicate]

Here is the percentage of normal forms among fertile mens according to the centile (Source: Cooper et al. 2010): 2.5: 3% 5 (below this is Teratozoospermia): 4% 10: 5.5% 25: 9% 50 (median): 15% 75: ...
0
votes
1answer
179 views

Why don't intelligent animals like primates use plastic bags? [duplicate]

I'll be honest here. Although this is a serious question, what made me wonder about it is this comic from Wumo: This question is not specific to monkeys. It applies to animals that live with or ...
2
votes
1answer
154 views

Why are there still useless traits/mutations in our body [duplicate]

Why is it that through decades of evolution , some seemingly useless body traits such as earlobes and pubic/chest hair still remains while other traits are generally replaced through evolution?
1
vote
1answer
116 views

How did evolution support sports, fun, entertainment etc [duplicate]

We know that many animals entertain themselves by playing games. But sports actually increases risks of death,or at least accidents. So why did evolution choose it? And why did evolution decide to ...
1
vote
1answer
858 views

Why don’t humans have eyes at the back of their heads? [duplicate]

How does evolution rule out the possibility of humans or others fragile herbivores from having 2 pairs of eyes, one at the front and the other at the back of their heads? Why didn’t that ever happen?
2
votes
1answer
245 views

Why would pedophilia exist? [duplicate]

From an evolutionary perspective, why would anyone ever be sexually exited by small children who could not possibly have started puberty? Is it a confusion between some combination of sexual and non-...
2
votes
1answer
125 views

If a trait does not appear to be advantageous to organism, why does the organism have it? [duplicate]

Why do organisms have some traits that do not appear to have any evolutionary advantage?
0
votes
0answers
124 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 ...
1
vote
1answer
119 views

What is the biological/evolutionary advantage to baldness? [duplicate]

Male pattern baldness is a common genetic trait. With a distinctive pattern/ density gradent (as apposed to general old age thinning as the body ages) Hair has an advantage of protection from the sun/...
3
votes
0answers
65 views

What is the advantage of being tired after having a sex? [duplicate]

When we have a sex with partner, we feel so tired that we don't have any power to do anything. Then it would be disadvantage to the animals, of course humans too, for they are exposed to danger. For ...

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