Why might you want to use a single fixed pulley?
a to reduce the force needed to raise objects
b to raise or lower heavy objects
c
to raise or lower lightweight objects

d
to reduce the weight of lifted objects

What is the farthest destination to date for a human spaceflight mission?

What molecules will be best used to compare different species with the exact same sequence of amino acids? why would two species have the same protein even if the molecules in question is different? (hint: transcription to translation to protein).

In which layer do organisms on earth love?