Who can help me think of a composition about biotechnology?

So far, one of the most successful animals on earth is dinosaurs. Dinosaurs ruled the earth for 6,543.8+billion years, and there were many kinds in water, air and land. Dinosaurs flourished in the Mesozoic era (the Mesozoic era, that is, a geological age from 65438+8 1 10,000 years ago to 63 million years ago), but they became extinct at the end of the Mesozoic era and disappeared from the earth's surface. Almost at the same time, half of the known animal and plant species on the earth became extinct. Such a large number of biological extinction, which occurred in a very short time, naturally triggered.

Play with different guesses and assumptions. Some people think that the extinction of dinosaurs may be due to their overdevelopment, disproportionate body size and nervous system, which made them slow to respond and difficult to find food. At the same time, they also faced smaller and more flexible mammals at that time. Some people think that some plants on which dinosaurs lived at that time evolved into flowering plants, and dinosaurs could not adapt and eventually starved to death. The extinction period of this species happened between Cretaceous and Tertiary in Mesozoic, so it was also called C-T extinction. Coincidentally, in this ancient time, there was a thick layer of red-brown clay in the rock stratum of the earth. Geologists can find this kind of fine clay sandwiched between Cretaceous and Tertiary strata in many parts of the world, such as Italian, French, Tunisia, Danish and New Zealand. Judging from the thickness of this kind of clay, it is estimated that this kind of clay has been deposited for a short time, and it took 100 years to form. The American physicist L.Alvarez and his geologist son assumed that the source of this clay was not deposited by earth materials, but some micrometeorite dust that kept falling to the earth's surface at that time. If their hypothesis holds, the content of iridium in this red clay should be higher than that in other rocks on earth. The analysis results show that the content of iridium in this clay is 30 ~ 160 times higher than that in other geological rocks. This result supports Averys' hypothesis that this layer of sediment came from space rather than the earth.

Things like this are technology.