What is the waxy covering on plant leaves?

Which is a tiny structure located in the cytoplasm of a cell?

Fish take in oxygen through their gills; what do insects take in oxygen through?

The brain is divided into how many lobes?

What organ filters blood and helps regulate salt and water levels?

What happens to your skin's blood vessels as you exercise?

Where in the body is blood produced?

Which cell part is responsible for controlling most of the activity inside a cell?

What is the basic unit of function and structure in living organisms?

What part of the brain is responsible for vision?

What is the name for a virus that infects a bacteria?

What is a cell that provides energy for another organism called?

What substance in your ears helps keep germs and dirt out?

What layer of the skin is just below the surface?

What does the substance melanin control?

What do conifers use to hold seeds?

What are chitterlings?

What type of muscle bends a joint in the body?

How many stages are in a butterfly's life cycle?

What part of the plant gets water and nutrients to the rest of the plant?

What powdery substance contains the male sex cells of a flower?

With what process do living creatures make more of themselves?

What light-sensitive cells in the eye detect colors?

What do you count on a tree to tell how old it is?

What natural biological defense system protects the body from disease and fights off germs?