The type of holozoic nutrition where organisms feed on both plant and animal substances is

Holozoic nutrition is a mode of nutrition in which organisms ingest solid or liquid organic food, digest it internally, absorb the useful nutrients, and egest the undigested waste. This is the typical mode of feeding in most animals.

Within holozoic nutrition, organisms are classified according to the type of food they consume:

• Omnivorous organisms feed on both plant and animal material. Humans, pigs, bears, and domestic fowl are common examples. Omnivores typically possess a mixed dentition - incisors for cutting, canines for tearing, and molars for grinding - reflecting their varied diet.
• Herbivorous organisms feed exclusively on plant material. Examples include cattle, rabbits, and grasshoppers. They often have broad molars for grinding tough plant fibres and longer digestive tracts to process cellulose.
• Carnivorous organisms feed exclusively on other animals. Lions, hawks, and sharks are examples. They have sharp teeth or beaks for tearing flesh and shorter guts suited to a protein-rich diet.

Saprophytic nutrition is fundamentally different from the three categories above. Saprophytes, such as many fungi and certain bacteria, feed on dead and decaying organic matter by secreting enzymes externally onto the substrate and then absorbing the digested products. This is extracellular digestion without ingestion, so saprophytic nutrition does not fall under holozoic nutrition at all.

Since the question asks specifically about holozoic nutrition involving both plant and animal food sources, the correct classification is omnivorous.