The Next Few Questions Refer to the Following Description and Table

question 7

Multiple Choice

The next few questions refer to the following description and table.
Diatoms are encased in Petri-platelike cases (valves) made of translucent hydrated silica whose thickness can be varied. The material used to store excess calories can also be varied. At certain times, diatoms store excess calories in the form of the liquid polysaccharide, laminarin, and at other times as oil. The following are data concerning the density (specific gravity) of various components of diatoms, and of their environment.
Specific Gravities of Materials Relevant to Diatoms

-Judging from the table and given that water's density and, consequently, its buoyancy decrease at warmer temperatures, in which environment should diatoms (and other suspended particles) sink most slowly?

• A)cold fresh water
• B)warm fresh water
• C)cold sea water
• D)warm sea water
• E)warm brackish water

Understand the importance of validity in counseling.

Comprehend the concept of content validity ratio and its significance in test construction.

Recognize the importance of timing and method in collecting criterion performance scores for criterion-related validity.

Understand the factors influencing test reliability.

---

Definitions:

Reaction Reagents

Substances or compounds added to a system to cause a chemical reaction or are consumed in the reaction.

Nucleophilic Aromatic Substitution

A reaction where an electron-rich nucleophile displaces a leaving group in an aromatic ring, typically under conditions where the aromatic ring is activated towards nucleophilic attack.

2,4-Dinitrochlorobenzene

A chemical compound characterized by a benzene ring with two nitro groups (NO2) and one chlorine atom attached to it at the 2, 4, and 6 positions, respectively.

NaOH

Sodium hydroxide, a strong base used in both industry and laboratories.