Use "structure", not "design". As in: "The human body's structure is...", not "The human body's design is...". There is no need to use the word "design" to ref

Use "structure", not "design". As in: "The human body's structure is...", not "The human body's design is...". There is no need to use the word "design" to refer to the complexity of the human body. "Design" implies a creator; "structure" simply describes those aspects of the human body (or life in general) that makes it "work" and does not imply a creator.