Mechanical energy is conserved in the presence of which of the following types of forces? select all that apply. a- electrostaticb- frictionalc- magneticd- gravitational

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.

d. platinum would have the greatest temperature increase because it has the lowest specific heat.