Which of the following lists the steps of technological development in the
correct order, from first to most recent?
a. (1) telephone; (2) cordless telephone; (3) telegraph; (4) mobile
phone
b. (1) telephone; (2) telegraph; (3) mobile phone; (4) cordless phone
c. (1) telegraph; (2) telephone; (3) cordless telephone; (4) mobile
phone
d. (1) telegraph; (2) mobile phone; (3) telephone; (4) cordless phone

C. (1) Telegraph; (2) telephone; (3) cordless telephone; (4) mobile

phone

Explanation:

Telegraphs were used as a source of communication in very early days. Telegraph is a device which uses electrical signals to transmit messages across long distances and it was invented in 1830.

Telephone is another communication device which was first used in 1876. It is an electronic device which is stationary and fixed at a position through wiring and it is used for communications across short or long distances.

After telephone, cordless telephone came into existence as an advanced form of telephone because cordless is not fixed at a location through wiring and it could be moved from one place to another within a short range. It was first introduced in 1995.

Mobile phone is the most advanced type of telephone used for communication and they are not fixed at a position. People can carry mobiles with them even if they are travelling across long distances. They first came in use in recent years.

answer: the correct option is d. enzyme

lactase and carbonic anhydrase are the examples of enzymes.

lactase is an enzyme, which is present in the small intestine of mammals. it in the digestion of the disaccharide, lactose ( milk sugar) by converting it into two monosachharide, which are glucose and galactose.

carbonic anhydrase is present in the red blood cells. this enzyme plays significant role in the transport of co₂. it in the conversion of co₂ and h₂o into carbonic acid, which is then dissociated into bicarbonate ions and hydrogen ions.