Quiz 3. A beaker contains three solids: flour, sugar, and baking
soda. Which describes the contents of the beaker?
А
heterogeneous mixture
B
homogeneous mixture
С
solution
D
suspension

А . heterogeneous mixture

Explanation:

A heterogeneous mixture is defined as the non-uniform mixture of two or more substances and can be easily separated. Two or more solids mixed together is an example of a heterogeneous mixture.

In the given example three solids: flour, sugar, and baking  soda is present in the beaker is non-uniform constituents and represents a heterogeneous mixture as the contents are mixed together but they are still in the solid form.

Hence, the correct answer is "А . heterogeneous mixture".

the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.