Reviewing the intake form is the best first step because it immediately provides essential background about the client—medical history, medications, allergies, skin conditions, past reactions, and specific goals. This information helps you identify safety concerns or contraindications and shapes the questions you’ll ask to uncover the client’s needs. With that context, you can tailor the consultation to be focused, efficient, and personalized from the start. Greeting the client and building rapport is important, but it doesn’t supply the critical data you need to plan safely and effectively. Explaining pricing or suggesting services should come after you’ve reviewed the client’s information and clarified their goals.

Hormones are chemical messengers that travel through the bloodstream to signal other parts of the body and regulate various physiological processes. Insulin, adrenaline, and estrogen all fit this role because each is produced by a gland and acts on target tissues to influence metabolism, stress responses, and reproductive development. They aren’t enzymes, which speed up chemical reactions; they aren’t nucleic acids, which store genetic information; and while some hormones are proteins and others are steroids, their defining feature here is their signaling function. Insulin is a peptide hormone that lowers blood glucose, adrenaline primes the body for quick action, and estrogen governs reproductive traits and cycles. So, they are hormones.

The bonds that cross-link the hair’s cortex to give it elasticity and strength are disulfide bonds, salt bonds, and hydrogen bonds. Disulfide bonds are covalent links between sulfur atoms in cysteine amino acids; they are the strongest of the three and largely determine the hair’s shape and structural integrity. Salt bonds are ionic connections between oppositely charged side chains; they’re weaker than disulfide bonds and easily affected by pH changes, contributing to how the hair holds a chemical service’s result. Hydrogen bonds are weaker interactions between hydrogen and electronegative atoms, but there are many of them, so they collectively influence how the hair behaves with moisture and heat, affecting temporary elasticity and shape. Because all three types form the network that gives the cortex its strength and elasticity, this option is the most complete description. Choices mentioning only one or two types don’t capture the full cross-linking system.

The idea being tested is how a guideline can evolve by moving a small piece from one subsection into the next, where that piece becomes the new guideline. This is a traveling approach: a tiny slice of the previous section travels forward and redefines the next guideline, keeping the document’s flow tight and continuously updated. This fits traveling guide because it explicitly involves that movement of a small excerpt to the next position and reestablishing it as the current rule. It isnates forward with the content, rather than staying in place or changing in other ways. The other concepts don’t capture this forward-shifting behavior. A stationary guide stays where it is and doesn’t migrate a fragment forward. A boundary guide focuses on edges between sections rather than moving content forward. A progressive guide implies gradual updates, but not the act of relocating a specific slice to become the new guideline.