(science) Which shared derived characteristic do reptiles, marsupials, and dogs have?

Amniotic egg
Fur
Retractable claws
Shearing teeth

The step-down transformer gives a current of 10a at 24v if the primary voltage is 240v calculate the 1_primary current 2_the power input 3_the power output

What is the answer to these problems 30 pt

Uwill get answer it brainliest will be awarded for →calculate the pressure exerted by a body having a mass of 30kg over an area of contact 400cm2.also explain it for every step there should be