Maria examines a mixture that appears to be the same throughout. however, when she looks at a sample using a magnifying lens, she can see small droplets of liquid surrounded by another liquid. which conclusion best fits her observations? the mixture is a solution because it has the same appearance throughout the sample. the mixture is a suspension because it is composed of two different-appearing substances. the mixture is a heterogeneous mixture because one liquid is dissolved in the other. the mixture is a colloid because two different substances can be seen in a small sample.

Answer is: The mixture is a colloid because two different substances can be seen in a small sample.

Colloid is microscopically insoluble particles that are suspended throughout another substance. For example whipped cream and gelatin.

For example, in the presence of an emulsifying agent, a mixture of oil and water becomes a colloidal dispersion.

Colloidal dispersion otherwise colloid is a system, in which discrete particles, droplets or bubbles of a dispersed phase (in this case oil), whose size at least in one dimension is in the range from 1 to 1000 nm are distributed in the other, usually continuous phase - dispersion medium (in this case water) differing from the dispersed phase in composition or state of aggregation.

c-14 is carbon-14, or radiocarbon.   it is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.