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Practice problem

Made of Cells — Characteristics of Life

By Hannah Bonville
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Margaret found a greenish substance on the bottom of her shoe. She decided to look at it under a microscope. Here are her findings. With her eye, she noted that the substance is primarily green but has small flecks of red and black. It has no defined shape and is oily and wet. With her microscope, she observes that it is a mass made of 400-500 green cells. The black flecks appear to be small pieces of rock.

Which of the choices below best describes the green substance on Margaret's shoe?

Choose one answer

Type a concept, like “slope” or “photosynthesis”.

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