3,327 reputation
727
bio website slu.se/ecology/tobiasjeppsson
location Uppsala, Sweden
age
visits member for 1 year, 5 months
seen 1 hour ago

Researcher in ecology/conservation biology.

profile for fileunderwater on Stack Exchange, a network of free, community-driven Q&A sites


1h
comment Is there a maximum size for an insect?
Also see biology.stackexchange.com/questions/17488/…
1h
comment Where do migratory birds go when it rains?
Nominating to reopen, since nobody has stated clearly in the comments why it should be closed as opinion-based.
1h
revised Where do migratory birds go when it rains?
Minor clarification
2h
comment Absorption of foreign bodies through the alveoli
Then add/link this to your question to give some perspective. People shouldn't have to trawl around unspecified links to understand exactly what/why you are asking.
4h
reviewed Close Absorption of foreign bodies through the alveoli
4h
comment Absorption of foreign bodies through the alveoli
Give some background to your question and what you know from before. To me this looks like a homework-type question.
14h
comment How big a box would it take to hold all of humanity?
Somewhat related: A mole of moles (from xkcd/What if?).
14h
reviewed Leave Closed Accelerated tree growth
14h
reviewed Close Why do fungi need water?
1d
reviewed Leave Open What is the genetic IQ?
1d
reviewed Leave Open Where do migratory birds go when it rains?
1d
revised Why do we need red blood cells?
addition
1d
comment Why do we need red blood cells?
@inf3rno Yes that would be better, to remove the appearance of evolutionary purpose and that evolution is actively searching for "easy" solutions.
1d
revised Why do we need red blood cells?
addition
1d
answered Why do we need red blood cells?
1d
comment Why do we need red blood cells?
For a question like this it is useful to look at other solutions to the same problem. For instance, the second most common molecule for oxygen transport is Hemocyanin, and this is not bound to cells but is directly suspended in hemolymph (arthropod/mollusc "blood"). Also, while there seems to be good reasons for why hemoglobin is bound in RBC, you should at least entertain the idea that the cause of RBC-bound hemoglobin in vertebrates is an evolutionary contingency (i.e. a random historical event).
1d
comment Why do we need red blood cells?
This is not a topic I know well, and the answer clearly contains lots of useful information. However, I find this answer really problematic since it is filled with teleological arguments in relation to evolution, e.g. "...why evolution created this cell type..." and "...creating a new cell type was the easiest way to the evolution..." This is simply not how evolutionary processes work, and even if this is not intentional, it can still cause a lot of confusion.
1d
revised What kind of fly is this?
resized pics
1d
revised What kind of fly is this?
missed update
1d
revised What kind of fly is this?
added 2 characters in body