In many parts of the world, killer whales prey on fishes or marine mammals, but not both. Worldwide, killer whales have been observed preying on more than 140 species of animals, including many species of bony fish, sharks and rays, and 50 different species of marine mammals.
A coordinate system is a two-dimensional number line, for example, two perpendicular number lines or axes. This is a typical coordinate system: The horizontal axis is called the x-axis and the vertical axis is called the y-axis. The center of the coordinate system (where the lines intersect) is called the origin. The axes intersect when both x and y are zero. The coordinates of the origin are (0, 0). An ordered pair contains the coordinates of one point in the coordinate system. A point is named by its ordered pair of the form of (x, y).
Understand the axes of the coordinate plane. When you're graphing a point on the coordinate plane, you will graph it in (x, y) form. Here is what you'll need to know: The x-axis goes left and right, the second coordinate is on the y-axis. The y-axis goes up and down.