Search found 1276 matches

by Darby
Sun Jan 25, 2015 10:36 pm
Forum: Evolution
Topic: human dietry evolution since the agricultural revolution?
Replies: 11
Views: 11989

Re: human dietry evolution since the agricultural revolution?

Why would he think that humans are exempt from evolution?

An example of dietary evolution is persistance of lactase production in dairy-use populations.
by Darby
Fri Nov 21, 2014 2:07 pm
Forum: Physiology
Topic: Stomata remain closed at night then respiration
Replies: 4
Views: 11658

What makes you think that the stomates are closed throughout the night? They may not be open throughout, but they don't need to be, any more than your mouth has to be open all the time for your respiratory needs. Night is also the best time to recharge the interior with carbon dioxide with minimized...
by Darby
Fri Nov 21, 2014 2:04 pm
Forum: Genetics
Topic: Mitochondrial DNA
Replies: 6
Views: 11725

What "strategies"?

And who is the "we" here - all eukaryotes?
by Darby
Fri Nov 21, 2014 1:17 pm
Forum: Zoology Discussion
Topic: Are these wolves or coyotes?
Replies: 4
Views: 5954

Re: Are these wolves or coyotes?

You probably already know this, but there are a couple of unreliable "tells" at work - more distinctive markings on the face, more robust body, less bushy tail for the wolves. It's hard to get a size from the pictures, so that's not too useful. It LOOKS more like a wolf, but it also looks ...
by Darby
Tue Jul 15, 2014 7:41 pm
Forum: Human Biology
Topic: Why similar features are preserved in a gigantic population?
Replies: 2
Views: 3955

Re: Why similar features are preserved in a gigantic population?

You're not taking into account the much smaller numbers just a handful of generations ago.
by Darby
Tue Jul 15, 2014 7:39 pm
Forum: Human Biology
Topic: Vitamin D absorption for different skin types
Replies: 5
Views: 7945

Re: Vitamin D absorption for different skin types

This seems to be an area that is just beginning to draw research interest. Darker skin evolved in high light-exposure populations to protect deeper skin layers from UV damage, but tones lightened in pops with lower exposure, to allow enough UV to reach the D-generating skin tissues. Dark-skinned peo...
by Darby
Tue Jul 01, 2014 12:44 am
Forum: General Discussion
Topic: Can anyone identify it ?
Replies: 1
Views: 1888

Re: Can anyone identify it ?

Looks like some type of mayfly.
by Darby
Tue May 20, 2014 6:42 pm
Forum: General Discussion
Topic: biology urgent need help?
Replies: 3
Views: 4793

They could all be potentially confounding, if the insects sense and respond to -
A - Humidity
B - Geomagnetism
C - Different stimuli at different ages
D - Polarization of light interacting with the materials
E - Frequencies of light
F - Temperature

Some are more likely, but all are at least possible.
by Darby
Tue Apr 08, 2014 5:16 pm
Forum: Evolution
Topic: Please check my answers.
Replies: 1
Views: 10647

You're doing well, up to the last one. Think about what those folks had to work with, and where the idea came from in the first place. The ones where you have two answers are both badly written question-answer combinations. For number 3, A assumes that changes in nature are always slow, which they'r...
by Darby
Tue Mar 11, 2014 5:07 pm
Forum: General Discussion
Topic: animal behavior
Replies: 5
Views: 4631

Think about communication when you are a small animal in a lot of foliage...