41.   The flowers attract several different kinds of insects.

42.   The new vaccine aims to trigger a different kind of immuno-response, producing not antibodies but cells-killer T-cells.

43.   The software then does the calculations, using built-in data on the energy cost of traversing different kinds of terrain.

44.   The student learns to recognise and distinguish between different kinds of events and responds to them appropriately.

45.   The weather, too, attracts a different kind of tourist.

46.   There are also different kinds of drawing boards which will hold the paper firmly down and provide moving X and Y axes.

47.   There are different kinds of meetings, some emphasizing discussion of a particular topic, some with speakers.

48.   There are many billions of cells in an adult human body but also there are many different kinds of cells.

49.   There are many different kinds of mating systems in the various species of animals.

50.   There is room here to give only the briefest account of the different kinds of vertebrates.