Plant photosynthesis and the consumption of plants by animals is best explained by what unifying principle of life? a) all living organisms use energy. b) all living organisms maintain organization. c) all living organisms have evolved over the course of many generations. d) all living organisms maintain some level of homeostasis. e) all living organisms are composed of similar structures.

The correct answer is option A) "All living organisms use energy".

Explanation:

Even though living being use different strategies to obtain energy, an unifying principle among them is that all living organisms use energy to live. Plant use photosynthesis, which allows them to use sunlight, carbon dioxide and water to obtain energy. This classifies plant as producers, whereas animals that consume plants are primary consumers, animals that consume the animals that consume plants are second consumers, and so on.