Final answer:
Toenails do indeed grow slower than fingernails, which is a true statement. The growth of nails is affected by factors such as age and sex, and they are primarily made of a protein known as keratin.
Step-by-step explanation:
The statement that toenails grow slower than fingernails is true. This happens because the rate of growth depends on multiple factors such as age, sex, and even the season.
Regarding nail structure, a nail grows from a part called the nail matrix, and as it grows, older cells are pushed away, making the nail longer. Nails are mainly composed of a protein called keratin, which gives them their strength and hardness. Fun fact, if nails had nerve endings, cutting them would be painful.