If you plant a seed in a pot and grow it then what does it do? It sends out roots and gets bigger right? So by doing that, the seed increases its mass. If the seed increases its mass the wouldn't there be more mass in the pot after the seed sends out roots? If that is true, then why doesn't the earth get bigger with all of the trees sending out huge roots?
w!w
Using that same reasoning then what about every time a human or an animal is birthed why doesn't the atmospheric pressure increase? Or our atmosphere increase in size? Same thing with water levels when fish are born.
The growing seed gains mass from two sources, using carbons from carbon dioxide (CO2) due to photosynthesis and from other nutrients like fertilizer (potassium (K), phosphate (PO4), and nitrate (NO3).
There would be more mass in the pot where a plant grew from a seed, due to the carbons captured by photosynthesis. This was noticed probably in the early 1800's. The nutrients would have started in the pot (unless you added fertilizer) so there would be no change in mass.
With respect to the earth and longer time scales, eventually the plants will die and decay due to things like bacterial and fungal metabolism. Carbon dioxide (CO2) will be released by the metabolic processes and other chemicals (former nutrients) will be returned to the ground.
That just like blew my mind.
Where did you learn that Bill?
Biology classes I would guess.
Its kind of basic ecology.
How molecules flow through different different parts of the environment. Things like the carbon cycle (https://en.wikipedia.org/wiki/Carbon_cycle (https://en.wikipedia.org/wiki/Carbon_cycle)) or the nitrogen cycle (https://en.wikipedia.org/wiki/Nitrogen_cycle (https://en.wikipedia.org/wiki/Nitrogen_cycle)).
Also important to understanding aquarium maintenance.
Antoine Lavoisier
QuoteAntoine Lavoisier
Discoverer of oxygen.
Beheaded in the French revolution.
Quote from: BillT on October 18, 2015, 02:10:00 PM
QuoteAntoine Lavoisier
Discoverer of oxygen.
Beheaded in the French revolution.
Well you know the French....??
All nations go through a crazy phase. Remember the Crusades ??? Look at us. We have Donald Trump running highest in the polls of the republicans :o
Quote from: LizStreithorst on October 18, 2015, 03:12:55 PM
Remember the Crusades ???
A bit before my time, but I've read about them.....
Dennis
Before mine by just a bit....I don't even remember about WWII since I wasn't born until 1950. I know about the Nazis, too. These days The Muslims are going nutso and we a lot of folks here in the States don't like any of them just because they are Muslims. Most all are not fanatics. Most are just normal people trying to make lives for themselves.
Biology was such a great course to take in school. Remember dissecting frogs?....
With their little beating hearts still a thumpin' away. Yes. I remember. I only did it because it was forced on me. I suppose if I'd had guts I'd have refused.
Quote from: Mugwump on October 18, 2015, 04:03:27 PM
Remember dissecting frogs?....
I remember my lab partner..... good thing it was biology class. |^|
Dennis
Quote from: BillT on October 18, 2015, 02:10:00 PM
QuoteAntoine Lavoisier
Discoverer of oxygen.
Beheaded in the French revolution.
The concept of mass conservation is widely used in many fields such as chemistry, mechanics, and fluid dynamics. Historically,
mass conservation was discovered in chemical reactions by
Antoine Lavoisier in the late 18th century, and was of crucial importance in the progress from alchemy to the modern natural science of chemistry.
Quote from: Mugwump on October 18, 2015, 04:03:27 PM
Biology was such a great course to take in school. Remember dissecting frogs?....
I dissect fish every chance I get!
Dead stuff, yes. You're looking for answer when you dissect something dead. The answer might help the other fish.
The frog with the beating heart was brutal. I've been involved in many animal surgeries. Some on my own animals. I can handle it if good is hoped to come of it. That frog with the beating heart they made us do was just making a live animal die so we could see a beating heart. The lesson was painful emotionally and had no value to me. I was such a quiet little mouse back then. I did it was expected of me.
I dissected a frog last year :). It was so COOL. The girls were grossed out but that was to be expected.
Was it dead and reeking of formaldehyde or was it's little heart still beating?
Normally a frog would be pithed or it head would be chopped off before looking at the heart.
This removes any possibility of them feeling anything.
If they didn't do this, they probably did it wrong in some way.
A frogs heart (and the hearts of many vertebrates) can beat without a functioning brain.
I have had hearts of embryonic fish beating in tissue culture (without any body attached) for days.
They had been pithed.
To me, the pithing is kind of brutal, but not the stuff after that.
Pithed off for sure!
Ours was dead.
Quote from: BillT on October 19, 2015, 11:29:07 AM
A frogs heart (and the hearts of many vertebrates) can beat without a functioning brain.
I have had hearts of embryonic fish beating in tissue culture (without any body attached) for days.
Resembles some people I know.
Thank God I wasn't there when the poor things were pithed. How do they do it, Bill?
Quote from: GraphicGr8s on October 19, 2015, 07:28:53 PM
Quote from: BillT on October 19, 2015, 11:29:07 AM
A frogs heart (and the hearts of many vertebrates) can beat without a functioning brain.
I have had hearts of embryonic fish beating in tissue culture (without any body attached) for days.
Resembles some people I know.
LOL..... w!w
QuoteThank God I wasn't there when the poor things were pithed. How do they do it, Bill?
Pithing is kind of nasty. I prefer cold, or drugs, or beheading.
To pith a frog you stick a needle in the base of the skull where the vertebral column meets the skull. The needle goes into the brain, you wiggle it around which scrambles the brain's nervous system so it can't function anymore. The frog should at this point have no consciousness. Then you stick the needle down the vertebral column which destroys the neurons in the spinal cord. This stop reflexive movements which can occur with the brain or awareness. The frog does random movements caused by damaging the nervous system when doing this which is kind of gross.