A hollow plastic spherical bobber of mass 0.005 kg and volume 50 cm3 floats on the surface of a lake. The bobber supports a submersed fishhook and bait with a combined mass of 0.01 kg and a combined volume of 2 cm3. The density of water is 0.001 kg/cm3. If a fish grabs the bait, find the minimum downward force, Ffish, that it must exert to pull the bobber completely under the surface of the water. You may assume that the apparent weight of the fish is zero.

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.