Question

during biology class, students observed slides at 4x magnification using a light microscope. these slides are shown in figure 1.
based on the different structures in figure 1, which of the following characteristics provides evidence to classify some of them as living things?
a. they contain cells.
b. they have irregular shapes.
c. they can be seen using a microscope.
d. they show distinctive patterns under the microscope.
some of these slides contain material from living organisms.
unicellular organisms include amoeba. an amoeba is an organism that takes up water from the surroundings and releases it through special structures. the amoeba can also surround and capture food.
multicellular organisms include plants and animals. multicellular organisms have different levels of organization, starting with individual cells. cells combine to form tissue. different tissues combine to form organs. organs interact within different organ systems. different organ systems work together to allow the body of the organism to function.
as an example, their teacher showed the students the levels of organization in a urinary bladder (figure 2). the bladder is part of the urinary system, which is a body system that gets rid of liquid wastes.

Explanation:

Living things are made of cells. The slides in Figure 1 include a plant cell, an amoeba cell, and an animal cell (muscle), which all contain cells. A rock particle (non - living) does not have cells. Options B (irregular shapes - some non - living things can have irregular shapes too, like broken rocks), C (can be seen with a microscope - many non - living small particles can also be seen under a microscope), and D (distinctive patterns - non - living crystals can have patterns) are not exclusive to living things. The presence of cells (a key characteristic of living organisms) is the best evidence.

Answer:

A. They contain cells.