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Jan
29
awarded  Nice Answer
Dec
24
awarded  Yearling
Dec
14
comment Are there species that occupy several roles in the food hierarchy?
I thought I remembered answering a very similar question here before, but it turned out to be on Worldbuilding.SE instead.
Oct
12
comment Why are viruses considered microbes?
@Remi.b: My personal definition, as a theoretical ecologist, is that if you can meaningfully study its ecology and evolution, then it's alive. :) That easily includes viruses. Of course, if you define "ecology" and "evolution" broadly enough, that definition can also cover a lot of things we would not usually consider alive, such as languages and ideas. I'm not really sure if that's an argument for or against it.
Aug
28
revised Why do only two sexes exist for animals?
fix repeated word word in title
Aug
28
suggested approved edit on Why do only two sexes exist for animals?
Aug
17
awarded  Excavator
Aug
17
revised What insect is in this photo?
reupload images from imageshack to stack.imgur before they get replaced by ads; see http://meta.stackexchange.com/q/263771
Aug
17
revised What kind of caterpillar is this?
reupload image from imageshack to stack.imgur before it gets replaced by ads; see http://meta.stackexchange.com/q/263771
Aug
17
revised What is this insect I found in Russia?
reupload images from imageshack to stack.imgur before they get replaced by ads; see http://meta.stackexchange.com/q/263771
Aug
17
suggested approved edit on What insect is in this photo?
Aug
17
suggested approved edit on What kind of caterpillar is this?
Aug
17
suggested approved edit on What is this insect I found in Russia?
May
21
comment What is the contribution of the cockroach to the ecological environment?
They make more cockroaches. They also feed things that eat cockroaches, eat things that are eaten by cockroaches, and transmit microbes that are transmitted by cockroaches. Et cetera.
Apr
10
awarded  Revival
Dec
24
awarded  Yearling
Nov
13
comment Do biological facts determine when a human fetus is considered alive and human?
@JohnDubya: ... In any case, my point wasn't about whether, or to what extent, sperm and ova are distinct from the diploid life stages preceding and succeeding them, but about whether they count as "alive". It's very hard to come up with an objective definition of "a distinct living organism" that would exclude a human sperm cell without also excluding, say, a drone bee.
Nov
13
comment Do biological facts determine when a human fetus is considered alive and human?
@JohnDubya: Each ovum or sperm cell carries half the DNA of the parent that produced them; when an ovum is fertilized, the resulting embryo inherits half its DNA from the ovum, and half from the sperm. An ovum or a sperm is thus equally related to the parent that produced it, as to the child produced from it. If you consider the child "wholly separate and distinct" from the ovum, then, by the same argument, you should also consider the ovum "wholly separate and distinct" from the parent. (Well, almost. Relatedness gets a little tricky when ploidy changes, as notably seen in social insects.)
Sep
26
comment Why do different pain killers have different effects on people?
NSAIDs are a pretty diverse group of drugs. You might find en.wikipedia.org/wiki/Diclofenac#Mechanism_of_action interesting.
Sep
24
awarded  Autobiographer