This boss list tells you the name and how to defeat the boss.  Check out my walkthrough to get the bosses and were they are.
Ridley: This is barely a boss fight.  Let him beat on you until your down to 30 or so and he'll escape.
Chozo Statue: Shoot him with your missiles and if he's still standing just shoot him and jump over him when he get's to close.
Spore Spawn: Stay in a ball and wait until he opens his mouth, then shoot him with a missile and dodge the spore.
Kraid: Shoot him with your beam in the head, and when he opens his mouth, shoot a super missile or missile.
Crocomire: Shoot him in the head to push him into lava.  It'll take a couple shots but it's easy.
Phantoom: Shoot the blue crap until he's visible.  When he is, shoot missiles.
Botwoon: Shoot him when he comes out of his hole.  Easy.
Draygon: First off, destroy the cannons.  Then when he comes by shoot him.  You usually want to get him when he slows down.  Another way to do it is equipt your grappling beam and let him pick you up.  The use your grappling beam on the broken cannon and keep it there.  He's fried but so are you.  It'll deducted life.
Golden Chozo: It is the same as the last Chozo statue `cept he has some new moves.  Jump over him and launch super missiles. 
Ridley: He is kind of hard.  Bounce off the walls and when you get right in front of him in the air, shoot tons of missiles.  Either do this, or stay on the groung and wait for Ridley to ram it's tail into the ground.  Dodge it, and shoot him.  There is more than one way to defeat him though.
Mother Brain: The first form is easy.  Just launch missiles at him.  Then comes the grosteque form.  Go under his head and shoot him with all your missiles and when your out, charge your beam and shoot him in the head.  Then he'll mess you up and then all this dramatic stuff happen.  You'll now have a hyper beam.  Then just aim up and hyper his head off.
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