Final answer:
A steroid is considered a lipid. Steroids are lipids with a four-ring structure, and some steroids, such as cholesterol, are important components of cell membranes. Many other steroids are hormones.
Step-by-step explanation:
A steroid is considered a lipid. Steroids are lipids with a four-ring structure, and some steroids, such as cholesterol, are important components of cell membranes. Many other steroids are hormones.