Final answer:
An autotroph is an organism that can produce its own food. The giraffe is not an autotroph, while the euglena, oak tree, and daisy are autotrophs.
Step-by-step explanation:
An autotroph is an organism that can produce its own food using light or inorganic compounds as a source of energy. Euglena is an example of an autotroph because it contains chloroplasts that allow it to undergo photosynthesis and produce food. However, the giraffe is not an autotroph because it cannot produce its own food and instead must obtain nutrients from consuming plants as a herbivore. Both the oak tree and daisy are also autotrophs as they can undergo photosynthesis and produce their own food.
Learn more about Autotrophs