The word "tissues" in the passage mostl...

Câu hỏi:   The word "tissues" in the passage mostly means _______ .

A the smallest units of living matter that can exist on their own

B collections of cells that form the different parts of human, animals and plants

C very small living things that cause infectious disease in people, animals and plants

D the simplest forms of life that exist in air, water, living and dead creatures and plants