What did Virchow observe that led him to determine one of the main components of cell theory?

a cell splitting into two cells
small “rooms” in cork
plants that were composed of cells
microscopic units making up parts of animals

Angiosperms are the most successful terrestrial plants. which of the following features is unique to them and account for their success? a. fruits enclosing seeds b. wind pollination c. sperm cells without flagella d. embryos enclosed within seed coats e. dominant gametophytes