Describe briefly two levels of cell organization in living organisms giving an example of each type.
(i) Tissue: it is a collection of cells, similar in sizes, shape and function. Examples of tissues in plant are the xylem, phloem, etc.
(ii) Organs: It is a collection of cells, similar in size, shape and function. Examples of organs in plants are the root, stem, leaf, etc. Examples of animal organs are the heart, kidney, eyes, etc.