There are 25 elements found in living things. How many of these elements are found in some organisms but not all?

Six

Explanation:

All living things have six basic elements in common: carbon, hydrogen, nitrogen, oxygen, phosphorus, and sulfur, abbreviated as CHNOPS.

the answer would be d

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.