What is the outermost covering of trees and some plants called?

What are the small bones that make up a backbone called?

What is a "jonquil"?

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

What type of muscle bends a joint in the body?

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

What do poachers seek when they kill elephants for their tusks?

What science word means "to group"?

From what tree did aspirin originally derive?

What is the expected time an organism will live called?

What layer of the skin is just below the surface?

The first vaccine targeted which disease?

What is the biggest artery in the human body?

What is the fin on the backs of fish, some whales and dolphins called?

What does ER (of a cell) stand for?

What grows from an acorn?

Trisomy-21 is popularly known as what?

What is an urolith?

Where would you find the Nazca Lines?

What substance, found in food, helps move wastes through the body?

A person who specializes in the study of plants is called what?

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

By what process do plants use chlorophyll to make glucose, a food sugar?

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

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