Series means connecting a negative terminal of one battery to the positive terminal of another battery to increase the Voltage. A Parallel connection on the other hand, means connecting like (Positive to Positive and Negative to Negative) terminals of batteries together.eries means connecting a negative terminal of one battery to the positive terminal of another battery to increase the Voltage. A Parallel connection on the other hand, means connecting like (Positive to Positive and Negative to Negative) terminals of batteries together.
photograph from the Smithsonian Photo library, copyright 1993, Smithsonian Institution, used with permission. Saber-toothed cats are some of the best known and most popular of all Ice Age animals. They are among the most impressive carnivores ever to have lived.Two different types of saber-toothed cats lived in the midwestern U.S. at the end of the last Ice Age. One type was the familiar sabertooth, represented by the genus Smilodon. These cats had enlarged canines usually associated with the name sabertooth.Their canines were up to 18 centimeters (7 inches) long.A mounted skeleton of Smilodon fatalis is shown in the above photograph.ne type was the familiar sabertooth, represented by the genus Smilodon. These cats had enlarged canines usually associated with the name sabertooth. Their canines were up to 18 centimeters (7 inches) long. A mounted skeleton of Smilodon fatalis is shown in the above photograph.
Hoplophoneus is another type of saber-toothed cat classified in the Felidae or true cat family. This creature lived in the Oligocene (e.g., about 20 million years older than Smilodon). This picture shows various bones of the skeleton of Hoplophoneus. Note the skull with its saber teeth in the center of the picture. The canines have a sharp bend and fit into a groove on an expanded process on the lower jaw: a feature seen in other sabertooths but not in Smilodon. Note also that Hoplophoneus was a relatively small cat. The skull is only about 15 cm long.