Aruler is initially at rest when a student briefly exerts a downward force on the right end. the magnitude of the force exerted by the student is less than the weight of the ruler. assume that the pivot point in the center of the ruler is frictionless. answer the following questions based on this description.

In 1859, charles darwin published the first edition of on the origin of species, which explained his observations of various groups of animals that showed great similarities but minor differences. darwin concluded that if a population of one species separates into two different populations that live in separate locations, then over the course of many generations the different populations can develop into different species. this idea predicted many future biological findings and became the basis of modern biology. darwin’s explanation for why different species exist is best described as a(n) law. theory. inquiry. hypothesis.