Who proposed the two-kingdom classification system?

Who classified animals into two groups: those which had red blood and those that did not?

Which of the following is a correct characteristic of the domain Eukarya?

Into how many domains is the classification system of $Carl$ $Woese$ divided?

Discuss how classification systems have undergone several changes over a period of time.

Which scientist classified plants into trees,shrubs and herbs and animals into two groups based on the absence or presence of red blood cells?