Marshall wants to remove a tree stump from the ground. To do this he puts one end of a long beam under the stump and puts all his weight on the other end. His weight is just enough to lift the stump. The stump weighs 400 N. Marshall weighs 250. What is the mechanical advantage of the long beam Marshall is using?

What word is used to describe differences of individual organisms

Some birds look for food near cattle and other livestock. the movement of the cattle churns up the ground, making insects available to the birds. the cattle appear to be unaffected by the presence of the birds. what kind of relationship exists between the birds and the cattle? o a. parasitism o b. commensalism o c. predation o d. mutualism

Complete the statements to identify the first two steps of meiosis i. (1 ) the first and longest step of meiosis i is called i. (2)the second step of meiosis i is called i.