why were dinosaurs so much bigger then current living species? does it have anything to do with the?

Question

electromagnetic field around the earth diminishing?

Answer 1

Not all dinosaurs were huge. There were a great number of dinosaurs that were smaller than human sized, and even down to the size of chickens.

The big ones get all the press though, since we find them so impressive.

Amongst the carnosaurs, even the very biggest T. rex and other giants like Spinosaurus weren't much more than 3 to 5 tons in weight - comparable to rhinos and elephants today.

It's the great big herbivore dinosaurs that really tipped the scales. There are a few theories about why they were so big. Big critters like elephants are able to survive on really low quality foods - stuff with so little nutritional value that no smaller animal could survive on it. But with such large stomachs, big critters can eat it, gain the small amount of nutrition per unit, and then pass it on through. It'd be like surviving on a diet of Cheesies. You probably couldn't get enough nutritional value from a bag of Cheesies to survive, but if you could eat three tons of it a day, you could.

The big dinosaurs may have been able to survive on crummy food like pine needles and ginkco leaves through a strategy like this.

Their big size may have also helped them metabolically. Critters like mice have to eat constantly to maintain a high body temperature, but the bigger a critter is, the less surface area it has per volume, and it actually gets difficult to lose heat. Elephants have to use their ears for cooling radiators to maintain their body temperature. Huge dinosaurs may have been able to maintain the high body temperatures and garnered the advantages of that high body temperature (more efficient enzyme activity, etc.) without having to pay for it metabolically. They may have been facultatively 'warm-blooded' even though their metabolism was still poikilothermic.

As far as electromagnetic fields, there's no evidence that the electromagnetic fields around the Earth were appreciably different during the Mesozoic, nor is there any known mechanism via which the electromagnetic fields would affect the allometric growth rates of living organisms.

Answer 2

You know i ask the same thing to myself, "why are we here?" The answer is that we have to live to find out why we exist, who made us, is there anything else? We live to find the answers to our questions. Contemplating about committing suicide is against human belief. We are the only complex organism on this planet capable of saving and dooming ourselves If there is life out there (which there is), they don't seem to be helping us is because, ok imagine it this way...You are at a zoo, do you go into the pens and cages to help the animals? No, you watch far away so you don't disturb them and we don't have anything that they need Mankind has a long way to go and i would suggest living to see that glorious moment when we are able to have space-travel and colonizing other planets. Ok first, we are separated right now, we have to (lame to say but...) unite with each others and put our differences behind and move forward to the future, ie consider space-travel I guess you can say that the spirit of mankind or humans in general is that we can survive against anything that gets thrown at us. Remember all it takes is 1 person to make a mistake in a formula and the whole thing comes crashing down. We still have a long way to go Dont commit suicide, you are being irrational. A philosopher would never give up, mankind should not give up, sigh...You seem to have a very pessimistic attitude but it does not matter. I would want to live for that day that we are capable of finding out why we exist

Answer 3

There is quite a lot of misinformation in the answers given so far. The largest animal known ever to have lived is the blue whale, which is still
living, though whalers have almost exterminated it.
There were a fair number of small dinosaurs, but
the large ones get the most publicity.

Energy is still somewhat of a mystery, but it is
certainly not equivalent to magnetism. Small
animals do not retain energy better than large ones, just the opposite, they lose it more rapidly
because of their large surface area in relation to
their volume. The biggest dinosaurs may have
been warm-blooded simply because their large
mass made it difficult for them to lose heat.

Large animals do tend to disappear more quickly
than small ones in times of stress. This results
from at least two causes - they require more
resources to sustain them, and their population
sizes are smaller than those of smaller species.

Answer 4

More food and more room to "grow", sorta like how a goldfish grows to fit the size of the bowl you keep it in. All the land in the world was very close together so there were vast areas of food and space. When the continents started to drift further apart and the environment started to change and plant species started to specialize to take advantage of this the bigger animals began to die and that meteor simply took care of those still hanging on.

Answer 5

that's a pretty good hypothesis. if you look at the evolution of animals on earth, the trend is going to smaller species. most larger animals are either already extinct, or endangered. the smaller the organism the more surface area the organism has, thus, it can retain energy more readily, which in the most basic terms, is magnetism.

Answer 6

Things were different before the flood, we live in a destroyed world. Before the bibical flood, folks were living to be 800 to 900 years old, there was more oxygen in the air and there was more atmospheric pressure, repitles live as long as humans, and never stop growing. Let a lizard live to be 900 years old and never stop growing, in those conditions, and you get a really big lizard. Todays lizards can't live that long and don't have the extra oxygen to get really big like they used too.

Answer 7

I think it has something to do with it being warmer then. Hence there were more plants and more food to sustain a large animal.

Answer 8

because: The earth's gravity was less in that time.

http://www.geocities.com/ramin1102000/bookpage.html

Answer 9

Cause God made them as pets for the earth at the time.
It has nothing to do with magnetic forces.