76 Answered Questions for the topic Evolution

Evolution Botany Pharmacology

04/07/19

Why have certain plants evolved to contain psychoactive compounds?
Plants such as marijuana (*Cannabis*) and kratom (*Mitragena speciosa*) contain compounds that affect the human brain. Why have these plants evolved to incorporate substances like THC and... more
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Evolution Anatomy

04/05/19

Periodic Muscular Growth in Humans?
If a healthy human is at a certain muscle state and then experiences muscular atrophy solely due to disuse/lack of exercise, is it easier to gain that muscle back than if the human had never... more
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04/03/19

Why did a lot of common insects evolve such a thin waist?
Something that doesn't quite make sense to me is why lots of insects like ants, bees and wasps have a such a small petiole when it connects many major organs to the rest of their body from a... more
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Evolution Anatomy Neuroanatomy

04/03/19

The first species having circle of Willis (circulus arteriosus cerebri)?
I know mammals are not the only species that have this anatomical unit (i.e. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3982101/). But I was wondering what was the __first species__ that had a... more
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04/02/19

Why do we have to exhale (or inhale) in order to speak?
Every time we speak, sing, or make any other kind of advanced noise with our throats, we exhale, or to put it that way, blow air through our throats. Why is this required? After all, speakers do... more
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04/01/19

Are mutations a source of genetic variation?
Here is a question from the book *SAT II Success Biology E/M* (where the SAT is the exam taken by the American high school students): > Which of the following statements is true about... more
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03/28/19

Immunity of Diseases Help
I'm trying to find more correlational diseases. For example, having Sickle Cell Anemia gives an immunity to Malaria. Having Tuberculosis gives an immunity to Cystic Fibrosis (or the other way... more
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03/27/19

Why are children afraid of the dark?
Why are children afraid of the dark, in particular more afraid than adults? Is it an evolutionary mechanism? What causes this?
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Evolution Zoology Genetics Dogs

03/27/19

Can any species be bred selectively/engineered to become as diverse looking as dogs?
I've done some research and it appears that dogs are the most diverse looking single species of mammals. The questions that interest me is - are dogs special in respect to genes/gene activation... more
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03/27/19

How did zootoxins evolve?
I've always wondered how toxins in certain organisms have evolved. Particularly, organisms that produce toxins as a deterrent to predators as opposed to organisms that use it to paralyze their... more
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03/26/19

Why is the heart not in the middle of the body?
All mammals that I can think of have a high degree of bilateral symmetry (In fact, almost every animal I can think of is like this).So why is the human heart not exactly in the middle of the body?... more
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03/25/19

Why the pronounciation of "Monsieur?"?
The French word *Monsieur* meaning Mister, looks like it should be pronounced `MON-sieur`, giving effect to the *O* and *N*. But I hear it pronounced more like `MISS-sieur`. Why is that? Is it... more
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03/19/19

Why has malaria only now started to develop resistance against artemisinin?
Why has malaria only now started to develop resistance against artemisinin, considering the compound has been in use for about two millennia in its herbal form in China?
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Evolution Anatomy Embryology

03/19/19

Evolutionary reason behind sharing the same path for food and air?
What is the evolutionary reason behind sharing the same path for food and air? For example, we have a nose and lungs, yet they are linked by the pharynx, which is shared with the mouth and... more
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03/18/19

Why haven't weeds overtaken the entire planet?
Given how rapidly weed plants spread and grow, choking out all other plant life, how come after millions of years we haven't ended with forests full of thistle or pokeweed, as opposed to pines or... more
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03/18/19

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... more
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03/16/19

What is the evolutionary reason behind the fragility of teeth?
Almost all organs in the human body have a rather large threshold within which the organ or tissue is capable of repairing itself using materials supplied by the body, whether it's made from... more
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Evolution

02/27/18

Is carbon dating ACCURATE
is carbon dating and the theory of evolution completely accurate or are they merely suggestions
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Evolution

12/01/17

What was the first life form on earth?
This is for school
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Evolution

06/09/17

a scientist crosses two different varieties of corn to produce a single variety that has traits from both parents. this technique is an example of
i need help to know more about evolution
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Evolution Biology

05/18/17

How is speciation occurred within the Ensatina species?
 I need to write a hypothesis, but first, I need to know what the answer to the question is.
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Evolution Jurassic

03/02/17

What evolutionary advances happened during the jurassic age?
 I need an answer as soon as possible.
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04/27/16

Ecology help-competition, coevolution questions, and lotka-volterra:
Competitive release is most likely to occur when a: A.Species colonizes an island that already has potential competitors B.Species moves into new habitats that it never occupied on a mainland... more
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Evolution Ecology Population

04/03/16

Population Growth Rate Problem: Researchers want to estimate the population size of Blanding’s turtle in Illinois
Researchers want to estimate the population size of Blanding’s turtle in Illinois. If they caught and marked 14 individuals on the first count, and 20 individuals on the second count, how many... more
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Evolution Biology Ecology

03/29/16

In an "ideal" world, organisms that are fine-tuned for reproduction would _______
Mature at birth Produce high-quality offspring continuously and in high numbers Live forever All of the above, taken together
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