Question

chemical (adjective)
chem·i·cal ke-mi-kəl
related to features/characteristics/properties of or reactions
between substances
\the rusty metal is actually an example of a chemical change.\
read the definition and the quote. use your knowledge of word
relationships to complete the analogy:
chemical is to substance as biological is to

observation
space
organism
experiment
chemistry

Explanation:

To solve the analogy, we analyze the relationship between "chemical" and "substance". "Chemical" relates to the properties/reactions of "substances". Now, "biological" relates to living things, and "organism" is a living entity. "Observation" is a method, "space" is a physical area, "experiment" is a procedure, and "chemistry" is a field—none fit as well as "organism" for the biological context.

Answer:

organism