00:01
Hello everyone in this question we will be discussing about the pattern of diversification in the fossil records.
00:11
So according to the fossil records we have seen that from the history of life through the microscopic cells to the modern world, these are populated by the rich variety of animals.
00:30
Plants, fungi and microbes, and this is more than 3 ,500 million years long.
00:40
And it was also seen that most of the significant episodes of diversification occurred during the cambrian to ordovician and throughout the mesozoic to sinozoic and in the peneirozoic alone five major and fifteen smaller mass extinctions disrupted the diversification of life and sometimes drastically altered the way of evolution and there was seen no common cause for these events but all were the consequences of the large -scale environmental problems and it is known that the sixth major extinction might be caused due to the human activities and it might be known as the anthropogenic mass extinction.
01:44
There is the consideration of diversity.
01:48
Typically this is defined as the number of taxa that is present within some defined time frame, geographic area or stratagem.
02:01
Graphic layers.
02:03
All of this is dependent on the traits that place an organism within the hierarchy.
02:11
So here in the options, the first option says that diversity has decreased since the cambrian explosion.
02:22
So the cambrian explosion happened more than 500.
02:31
500 million years ago and it was when most of the major animal groups started to appear in the fossil record, which is a time of rapid expansion of different forms of life on earth.
02:49
And it was seen that there was rapid increase of both the biodiversity as well as the morphology, disparity...