65% of bioelements is:
Correct answer: D. Oxygen
- A. Hydrogen
- B. Carbon
- C. Nitrogen
- D. Oxygen
Explanation
Oxygen is the most abundant element in the human body by mass, primarily because it is a major component of water, which makes up a significant portion of body weight.
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About Introduction to Biology
Biology is divided into fields such as botany, zoology, microbiology, genetics, ecology, physiology and biotechnology, each focusing on a different aspect of life. Levels of biological organization progress from atoms and molecules through organelles, cells, tissues, organs and organ systems to organisms, populations, communities, ecosystems and the biosphere.
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