Question

a scientist is investigating two samples. one is from a living organism, and the other is from a nonliving object. the scientist looks at both in a microscope. the scientist forgets to write down which sample is living and which is nonliving. what evidence from the investigation helps to determine which sample is living? object a is living, because cells with nuclei are visible. object b is living, because different kinds of cells are visible. object a is living, because all the parts are the same size and shape. object b is living, because the object has differently shaped parts.

Explanation:

To determine the living sample, we use the fact that living organisms are made of cells (often with nuclei, as in eukaryotic cells). Object A shows cells with visible nuclei, a characteristic of living things. Other options are incorrect: Object B’s parts don’t resemble cells, same - sized/ - shaped parts (Object A’s reasoning in one option) isn’t a living - specific trait, and differently shaped parts (Object B’s reasoning) don’t indicate life.

Answer:

A. Object A is living, because cells with nuclei are visible.