Explanation:About Elephant and its herd:The elephant is the largest existing mammal on the EarthThe herd follows matriarchy, i.e. the oldest female elephant becomes the head of the herd.There are 10 to 12 female elephants and young ones in a herd.It mainly consists of females and baby elephants.There is no male elephant in the herd, they leave when they turn 14 or 15.The herd sometimes is joined by the (bull) elephants depending on the climate and terrain.An adult elephant can eat more than 100kgs (1 quintal) of leaves and twigs in one day.A three-month-old elephant weighs about 200 kgs (2 quintals).Elephants do not rest much and sleep for only 2-3 hours per day.Elephants are usually found in tropical habitats.Elephants love to play with mud and water. The mud keeps their skin cool.Their big ears also work like fans. The elephants flap these to keep themselves cool.Family is what forms the basis of the formation of elephants but it can consist of more than one family.Thus, A. A herd may have 20-25 female elephants and young ones. - FalseB. Male elephants live in the herd till they are 4-5 years old - FalseC. An adult elephant can eat more than 100 kg of leaves and twigs in one day. - TrueD. In an elephant herd the oldest female elephant decides everything - True