Which statement is true?
lipids are a type of fat.
fats are a type of lipid.
fats and lipids are separate and unrelated substances.
all lipids are fats, and all fats are lipids.

The correct answer would be Fats are a type of lipid.

Fats are sub-types of lipids which are generally made up of fatty acid chains and glycerol. Other types of lipids are phospholipids, glycerophospholipids, sphingolipids, sterol lipids et cetera.

Fatty acids are the long aliphatic chains with carboxylic acid at one end. These chains can be saturated as well as unsaturated.

Glycerol is a polyol compound which is odorless and colorless in nature.

Fatty acid chains are attached to the glycerol with the help of ester bonds.

Most common type of glycerides are triglyceride in which three fatty acid chains are attached to the three OH groups of the glycerol (three chains per molecule).

an active site is a region that is present on an enzyme where the reactants or the substrate molecules we can say bind and experience a chemical reaction. the substrate is basically a reactant whose concentration is changing and that is converting into a product after binding at the active site of an enzyme

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]