There's an area in the crotch called the perineum, which rests against the saddle. If you get too much pressure there you can pinch some nerves and get into all kinds of discomfort. One way to relieve that pressure is by using a saddle with a cutout. It may be only a depression in the padding, but can also be a hole.
Pedals and seats
Wants would be your answer.
The safest baby bicycle seats sold on the market are the Tyke Toter mount, iBert child T-seat, weeride child seat, Schwinn Deluxe Carrier, or the Britax child bike seat.
either police hancuffs, bicycle with two seats, mobile phones or umbrellas
A tandem bicycle features two people riding on the same frame with two seats. The first recorded tandem bicycle was created in 1898 by Mikael Pederson.
of course,they are allowed.they have equal rights as men
Well, you sit on it. There's a bit of cushioning, maybe even some springs. It's wider at the back to support your sit bones and a cutout at the front to allow your legs so move.
Easy: don't ask.
Yes it will fit with room to spare for a rucksack
No, a bicycle is a manufactured item (it does not grow or form naturally). Many of the materials used in manufacturing bicycles (steel) can be recycled, and some may be natural (natural rubber tyres, leather seats) but this does not make it a renewable resource.
There are plenty of brands of bicycles for young girls. However, some of good brand of bicycles for young girls are Apollo cupcake girls bike, or another brand of bicycle is Trax.
they need better explanation