Answer: D) Companies replaced hand-operated brakes with air brakes on trains.
Answer:
Islamic philosophers developed the ideas of both the ancient Greeks And romans in mediaeval days and made substantial medical observations. There used to be a large curiosity in wellbeing and illness, and Muslim physicians and authors published widely about medicine, clinical procedure, disorders, therapies, remedies, and diagnosis, producing diverse literature.
In truth, from studying Arabic texts, Western doctors only learnt about Greek medicine, such as the studies of Hippocrates as well as Galen. Islamic scholars masterfully collected and organised information such that, across different texts, citizens could quickly interpret and compare details.
Important reasons for studying history are recognizing patterns, connecting the past to the present and revealing past contributions of civilizations.
The theory of evolution by natural selection, first formulated in Darwin's book "On the Origin of Species" in 1859, is the process by which organisms change over time as a result of changes in heritable physical or behavioral traits. Changes that allow an organism to better adapt to its environment will help it survive and have more offspring.
Evolution by natural selection is one of the best substantiated theories in the history of science, supported by evidence from a wide variety of scientific disciplines, including paleontology, geology, genetics and developmental biology.
The theory has two main points, said Brian Richmond, curator of human origins at the American Museum of Natural History in New York City. "All life on Earth is connected and related to each other," and this diversity of life is a product of "modifications of populations by natural selection, where some traits were favored in and environment over others," he said.
A modern political action would be the revolution of workers. Many people believed this statement would be the rallying cry for individuals who supported the Communist way of life. Many felt that it signaled an end to global capitalism.
