Im not sure if you meant 'why' or how' do clarinets and saxophones transpose. For the sake of logic, I will assume "How do clarinets and Saxophones transpose" as the alternative does not make sense to me.
Well, quite simply, from a Clarinet to a Tenor or Soprano Saxophone, there is NO transposing needed as the Clarinet, Tenor Saxophone and Soprano Saxophone are all Bb (B Flat) instruments (which means that a C on the Clarinet will sound the same as a C on those 2 saxes). However, for the Alto and Baritone saxophones, you will need to transpose, as Alto and Baritone are Eb (E Flat) instruments.
One thing to note is that a Clarinet has a Register Key, while a Saxophone has an Octave Key. The register key raises the pitch of a clarinet by a 12th (19 semitones) while the Octave key raises by an octave, or 8th (12 semitones). Just something to consider when making the transition :)
Clarinets and saxophones are both transposing instruments.
I believe it is the clarinets, flutes, saxophones, trumpets, and tuba
A flute
trumpets, trombones, saxophones, clarinets, oboes, and bassoons all use mouthpieces.
There are flutes, piccolos, clarinets, oboes, bass clarinets, bassoons, and all saxophones. Most school bands only have alto and tenor saxophones, maybe a bari-sax, and rarely a soprano saxophone.
Clarinets, Saxophones, Flutes...
saxophones and clarinets
Clarinets and saxophones are both transposing instruments.
I believe it is the clarinets, flutes, saxophones, trumpets, and tuba
A flute
Saxophones, Clarinets, Oboe, Basoon, Percussion, (if your talking about woodwind..)
trumpets, trombones, saxophones, clarinets, oboes, and bassoons all use mouthpieces.
Mostly clarinets and saxophones use ligatures but there might be a few obsolete instruments that use ligatures.
The simplest way is to transpose everything down a third (three semi-tones) Also, the piano is tuned in concert and the alto saxophone, as you know, is in Eb.
There are flutes, piccolos, clarinets, oboes, bass clarinets, bassoons, and all saxophones. Most school bands only have alto and tenor saxophones, maybe a bari-sax, and rarely a soprano saxophone.
A reed. Single reeds are used on the mouthpieces of clarinets and saxophones.
There are no "jazz instruments." You can find jazz pieces written for almost any instrument, including trumpets, saxophones, trombones, flutes, clarinets, piano, string bass, vocal parts, etc.