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
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
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
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
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
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
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
4 votes
4 answers
6k views

Is our genome decaying (see "Genetic Entropy"), and, if so, is this evidence for our genome being "young"?

In the book Genetic Entropy & the Mystery of the Genome the author says that the genome cannot be old because the genome is "decaying". Decay is a very subjective term, but in this case he means ...
Lucian09474'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
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
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
7 votes
1 answer
11k views

What is the standing genetic variation?

I am reading this review. In the first part, the author introduces Standing Genetic Variation, described as: STANDING GENETIC VARIATION Allelic variation that is currently segregating within a ...
gc5's user avatar
  • 820
1 vote
2 answers
697 views

Why does 360 degree rotation not seemed to ever have evolved?

Of the designs of species that have evolved, I am curious why a 360 degree rotation, like a joint that can spin, does not seem to have evolved, for example wheels or a propeller. Like, is there some ...
Julius Hamilton's user avatar
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

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