Question

1. what is the correct order of the levels of organization in a multicellular organism from smallest to largest?

cell → tissue → organ → organ system → organism
organism → cell → organ → tissue → organ system
tissue → cell → organ → organ system → organism
cell → organ system → organ → tissue → organism

1. what do a group of specialized cells form?

organ system
organ

Explanation:

• For question 1: In a multicellular organism, the cell is the basic unit. A group of similar cells forms tissue. Different tissues combine to form an organ. Organs work together to form an organ system, and all organ systems make up the organism.
• For question 2: A group of specialized cells forms tissue. But among the given options (assuming there might be a typo as the options seem incomplete in the original problem statement, but based on standard biology knowledge), if we consider the options provided in a general sense, a group of specialized cells forms tissue. However, if we assume the intended options are correct in a basic textbook - like context (even with the given limited options), we analyze as follows.

Answer:

1. Cell - Tissue - Organ - Organ system - Organism
2. (Assuming the full option set, but based on the given, if we consider the most basic level from the provided options, but there is an error as the correct answer for "a group of specialized cells" is tissue. If we assume the options are mis - written and we have to choose from the given): No correct answer among the provided options for question 2 (as a group of specialized cells forms tissue, not organ system or organ directly without the tissue level). For question 1: Cell - Tissue - Organ - Organ system - Organism.