Dichotomous keys are constructed based on
o combinations of characteristics in unknown organisms.
combinations of characteristics in known organisms.
genetic sequences in known organisms.
genetic sequences in unknown organisms.

they deliver oxygen to the blood

i believe it would be c: tons.

1. what is the relationship between the shape of an enzyme and the reactions they catalyze?

2. how does an enzyme inhibitor work?

separate your answers so i dont get confused : )