What was rudolph virchow's contribution to the cell theory ?
a. he concluded that cells come from preexisting cells.
b. he concluded that cells are the basic units of structure and function of all living things.
c. he concluded that all organisms are composed of cells.
d. he concluded that all cells are similar in composition and metabolic activities.

Just to confirm yes, R.V did conclude that cells come from pre-existing cells!

enhanced global partnerships and exploration capabilities may advance international preparedness for protecting the earth from catastrophic events such as some asteroid strikes, advancing collaborative research on space weather and protecting spacecraft by developing new means for space debris removal.

srxdctfvygbuhinjmok,plkmojnhbgvfctdrft6gyfcgvhbuinjok