Which describe colloids? check all that apply. heterogeneous mixtures homogeneous mixtures may have a uniform appearance are made up of at least two substances will settle out over time

Option (2), (3) and (4)

Explanation:

Colloids are the substances that are comprised of two or more particles that are comprised of large atoms (molecules), but they are so small that our naked eye can not identify them. These colloids are homogeneous mixture as a result of which they appear to be uniformly oriented. These particles do not have any definite shape but and their size usually ranges from 10⁻⁹ m to 10⁻⁶ m in size. Some of the examples of colloids are fog and smoke.

Thus, the correct answers are options (2), (3), and (4).

the element that provides strength to the exoskeletons of clams and oysters is phosphorus.

this is so because calcium carbonate is the main component in the shells. calcium carbonate is strengthened by phosphorus.

explanation:

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.