Linked Questions

54 votes
4 answers
10k views

Why do men have nipples?

I'd be tempted to call nipples in men vestigial, but that suggests they have no modern function. They do have a function, of course, but only in women. So why do men (and all male mammals) have them?
Shep's user avatar
  • 2,515
45 votes
3 answers
14k views

Are humans more adapted to "light mode" or "dark mode"?

I was discussing with a colleague about using dark-mode vs. light mode and remembered an article arguing that humans vision is more adapted to light-mode rather than dark-mode: I know that the trend “...
Alexei's user avatar
  • 1,675
42 votes
6 answers
11k views

If evolution is not about increased complexity, why does so much complexity evolve?

In my last question I asked why we don't see increased complexity in artificial life simulations of evolution. It seems I had fallen for a common misconception, that evolution was about improvement by ...
vonjd's user avatar
  • 1,061
42 votes
5 answers
6k views

Why did life not evolve to use radio?

We use electromagnetic communication everywhere these days. Cell phones, wifi, old-school radio transmissions, television, deep space communication, etc. I'm curious about some of the possible ...
Geuis's user avatar
  • 531
33 votes
7 answers
13k views

Is evolution a fact? [closed]

Richard Dawkins in one of his videos says that Evolution is a fact and not just a theory. He goes on to say that man and chimpanzees both evolve from apes. Is this correct (Is evolution a fact and ...
Farhan stands with Palestine's user avatar
27 votes
3 answers
12k views

Why haven't prey evolved the ability to always outrun their predators?

I can understand why some prey can't outrun a recently evolved species. However, since cheetahs have existed for so long, why haven't its prey evolved to always outrun it, driving cheetahs to ...
Timothy's user avatar
  • 886
16 votes
5 answers
2k views

Why have parasites not evolved to be harmless?

I have yet to understand why so many viruses or bacteria haven't evolved to be harmless (specifically, I don't know of any harmless viruses). I think it would be greatly beneficial for a virus to ...
chubakueno's user avatar
16 votes
1 answer
2k views

If plants "alternate generations" between sporophytes and gametophytes, why don't we say the same of humans?

I've been reading on Wikipedia about how plants alternate generations between a diploid sporophyte (usually the dominant part) and haploid gametophyte (in flowering plants, the pollen and ovule sacs). ...
Max's user avatar
  • 285
15 votes
2 answers
996 views

Evolution in 37 years, is it possible?

I am confused, can evolution ( speciation ) really occur in such a short time ? In 1971, biologists moved five adult pairs of Italian wall lizards from their home island of Pod Kopiste, in the ...
Özgür's user avatar
  • 561
11 votes
2 answers
12k views

Why do adult insects have 6 legs?

Apparently, there is an advantage to having 6 legs in the insect world. What is that advantage, if anything? Why would such an advantage exist for insects, but not for other, larger land animals? ...
DrZ214's user avatar
  • 1,421
10 votes
1 answer
1k views

Why are venomous mammals and birds so rare in comparison to reptiles and fish? [closed]

Why are venomous mammals and birds so rare in comparison to reptiles and fish? Metabolic reasons? Morphology? Selection pressures? Why are not all reptiles venomous but many are? Why are platypuses ...
li tchi.'s user avatar
  • 129
10 votes
3 answers
2k views

Genetic Diversity and Adaptation

I am somewhat new to evolutionary biology, having studied it on my free time as a computer science student. There is one particular thing that has always bothered me for which I have not seen a good ...
mellamokb's user avatar
  • 203
8 votes
3 answers
9k views

Why are lions the only social cats?

We know that almost all cats are solitary. How did the Lions (Panthera leo) end up social animals? Do we have an explanatory evolutionary path describing how the Lions became social while the rest of ...
mousomer's user avatar
  • 181
8 votes
2 answers
9k views

Why can't we grow more teeth?

A similar question but about teeth healing themselves is Do teeth have the capacity to heal?. So I understand that teeth have the capacity to heal themselves to a certain degree. It appears to be ...
TheLethalConstant's user avatar
8 votes
3 answers
3k views

why has evolution favored sexual reproduction using two mates over sexual reproduction using three mates?

Many animals species require two members — a male and a female — to sexually reproduce. Why has nature (or the process of evolution) chosen to favor the form of sexual reproduction which requires two ...
Yashas's user avatar
  • 261

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