Answer:
B
Explanation:
This is secondary innovation- It is a specific innovation process which originated an acquired developed technology , and then modified further modified and developed based on the template of the original technology. It usually common in the developing and middle developed countries as they build on the template and prototypes of the developed country's' technology.
Thus, in this case, the small toy represented the primary innovation, while the two-wheel cart represented the secondary innovation.
Answer:a substance that has a molecular structure consisting chiefly or entirely of a large number of similar units bonded together, e.g., many synthetic organic materials used as plastics and resins.
Explanation:
Answer:
The mass of a star determines its life cycle, that is, more the mass, shorter will be its life cycle. The mass of the star is determined by the concentration of matter, which is found within its nebula. In the nebula, with time, the hydrogen gas comes in close proximity with each other due to gravity and starts to spin.
With the brisk spinning, the gas heats up and turns into a protostar. The temperature now reaches 15,000,000 degrees and within the core of the cloud, the phenomenon of nuclear fusion takes place. The cloud now contracts a little, starts to glow brightly, and turns stable. The cloud now becomes a prime sequence star, and will stay in this phase for millions of years, the Sun of our galaxy is in this stage at the moment.
New, more adaptable species flourish, replacing the extinct species.
The selection pressures before the extinction tend to favor a certain type of organism and the sudden shift in conditions help others move up the food chain.