Mercury is a naturally occurring chemical, but it can become harmful when it enters the food chain.
A migraine is a neurological disorder marked by intense headache, nausea, visual disturbances and other symptoms.
Microcephaly is a condition in which a child's brain doesn't develop properly. The most obvious symptom is that the child has a smaller head than others of the same age and gender.
An herbivore is an animal or insect that only eats vegetation, such as grasses, fruits, leaves, vegetables, roots and bulbs.
"Natural" and "organic" are common on food labels, but the terms can be confusing. There are, however, specific definitions for each term.
Salamanders are amphibians that look like a cross between a frog and a lizard. Species include newts, mudpuppies and hellbenders.
Impalas are medium-sized antelopes that are native to Africa. They are great jumpers that use their speed to escape predators.
The phrase "busy as a beaver" aptly describes these big-toothed rodents that can change the landscape and their environment.
Badgers are small mammals that are ferocious hunters and members of the largest family of carnivores.
The tongue is a mighty flexible organ. It enables licking, breathing, tasting, swallowing and speaking.
Turtles, tortoises and terrapins are reptiles with protective shells. They live on land, in the ocean and in lakes and rivers. There are more than 300 species.
The nose is part of the respiratory system and also contributes to other important functions, such as hearing and tasting.
The stomach is a bean-shaped sack located behind the lower ribs. It is the first stop in the digestive tract before food moves on to the small intestine.