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3h
comment Does the DNA of a tadpole change after it becomes a frog?
Is your question a better fit for worldbuilding.SE? If so, we can migrate it there.
1d
comment Human bone density and Brown Bear bone density?
The "ash fraction" value is the key here. Bear bone is 66% mineral. Typical human cortical bone is 65-70% mineral. So, no, bears don't have denser bones than humans.
1d
comment Human bone density and Brown Bear bone density?
I have to think they are using density incorrectly, and since they provide no reference, we really can't check. There is no way that bone density, in the scientific sense, can be 10 times higher in bears. It says "for a given size," which indicates to me that it must mean some kind of skeleton as percentage of body mass. Or it's just made up, with no basis in observation.
Apr
24
comment Does the term “upper extremity” include hands?
I suspect that "hand" is separated out because it is often a surgical subspeciality. Hands are complicated.
Apr
5
comment Bolyerine Snakes maxillary bone, split?
What figure(s) are you having trouble with in the paper?
Apr
3
comment The selective pressure of contraceptives
@canadianer Is there any work on novel selective pressures resulting from widespread use of contraceptives and can these selective pressures be modeled on the selective response in the same way as antibiotic resistance or strong truncating selection?
Apr
3
comment The selective pressure of contraceptives
The topic is certainly welcome. Your question was closed for being unclear rather than off topic. It would have been nice if any of those who voted to close would have explained why. I've editing the grammar a bit and given it some structure.
Apr
3
comment Why did humans evolved the scratch reflex?
Humans didn't evolve the scratch reflex. We inherited it from 350 million years of mammal ancestors.
Mar
29
comment Why are killer whales found in the Gulf of Mexico smaller than ones found in the Pacific?
Has Bergmann's rule been suggested for the size disparity in Orca?
Mar
9
comment What is the minimum eye?
Comments are not for extended discussion; this conversation has been moved to chat.
Mar
9
comment What is the minimum eye?
Please continue this discussion in chat.
Feb
24
comment Is it possible to process electrical signals from the brain and interpret the results as exact thoughts?
I disagree to some extent. If you read "thought" as "intention to perform a motor action", then BrainGate (braingate2.org) has been reasonably successful.
Feb
13
comment What happens to our umbilical cord internally as we age?
Don't forget the urachus.
Feb
2
comment Why are fly not scared when landing on a monitor with changing graphics?
That's what I can't figure out. The OP describes things moving on the screen, which should activate the flicker effect.
Feb
2
comment Why are fly not scared when landing on a monitor with changing graphics?
I can't reconcile your answer with the well-studied optomotor response of fruit flies (e.g., ncbi.nlm.nih.gov/pmc/articles/PMC2846117), where in flies are tethered in place and their visual field is changed via LED screens, simulating movement. Photo here: depts.washington.edu/flyarama
Jan
29
comment why male penis not considered as cartilage?
@Remi.b Also see baculum: mapoflife.org/topics/…
Jan
29
comment Are boat-tailed grackles efficient flyers?
I added an image of the boat-tailed grackle for the unfamiliar.
Jan
24
comment Largest direct ancestor of humans
Except among the very recent ancestors of modern humans (and there is debate even there), generally we do not consider fossil species as direct ancestors. All fossil species are endpoints, tips of the phylogenetic tree.
Jan
22
comment What species of Cerapoda lived during the Jurassic?
I'm a little confused by your question. You ask specifically about Cerapoda, but your list includes several non-cerapod genera (Heterodontosaurus and Agilisaurus). Do you want only Cerapoda, or Ornithischia more broadly?
Jan
14
comment Safety of using industrial water for hand washing
You should ask this question of your university's Environmental Health and Safety department (or the equivalent). They will know the answer and are the only ones qualified to answer in your specific case.