Final answer:
Phytochemicals are plant-derived chemicals not currently classified as nutrients but may have health benefits, with research ongoing to establish their role in human nutrition. They are found in spices, vegetables, and fruits and may have antioxidant properties.
Step-by-step explanation:
Phytochemicals are a large group of plant-derived chemicals which include compounds like oils and colors that occur naturally in plants. Unlike vitamins and minerals, they are not yet classified as nutrients because, although they are believed to be beneficial to health and may be needed in small amounts, the scientific research is still ongoing to establish their exact role in human nutrition. Phytochemicals are abundant in spices, fresh vegetables, and fruits, and some of them are known for their antioxidant properties, which may protect against free radicals and reduce the risk of certain diseases such as cancer.
The correct answer to the question 'Phytochemicals are thought to positively influence health, and the term refers to' would be 'd. chemicals not considered nutrients in plants.'