This compound is named potassium chloride. Example 5: Write the name of the following formula: Na2S. First symbol is Na, so the first part of the name is sodium. (Note the presence of the subscript does not play a role in this name.) Second element is sulfur (from the symbol S), so the name is sulf + ide = sulfide. This compound is named sodium sulfide.
The viviparous sharks who carry the eggs until the pups are born, have different gestation periods. The dogfish shark is known to keep their eggs for 18 to 24 months. The bull shark gestation is about one year. The hammerhead shark gestation period is from 7 to 12 months. Other species that are ovoviviparous carry the eggs until the pups born alive and fully developed. They also have long gestation periods. The tiger shark gestation is about 14 to 16 months.
GIVING BIRTH TO LIVE SHARKS (VIVIPARITY). The female gives birth to live offspring, just like mammals, and they are born fully developed. There is a placental link to the eggs since they feed on the placenta. Specifically, the yolk sac develops within a placenta that is attached to the wall of the uterus and gives the offspring the nutrients necessary for their growth. Examples of viviparous are hammerhead sharks (Sphyrnidae family), the bull shark (Carcharhinus leucas) and the blue shark (Prionace glauca). These species give birth to live sharks which they abandon after the delivery. Newborn sharks instinctively know how to survive alone. Shark mothers do not take care of their young. EGGS DEVELOP INSIDE THE MOTHER (OVOVIVIPARITY)