A bird's body shape, muscles, feathers, and limbs are all adaptions that help a bird defy gravity and fly.
1 3 and 4... you are just counting up from 0
The answer is projectile. Handguns and rifles use a cartridge having a single projectile or bullet. Shotguns use a shot shell comprising either a single bullet or a big number of small projectiles (shot or pellets). Though, the basic components of cartridges and shot shells are alike.
This is true because the motherboard is the main holder of all the operation and connection of all the system.
