What does the substance melanin control?

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

What is the outer skeleton of organisms such as spiders and insects called?

How many bones are in each finger, except the thumb, of a human hand?

What is the expected time an organism will live called?

Which nutrient group is used to help grow and repair cells?

What vitamin does the sun's ultraviolet rays help the skin produce?

What is a hominid?

What is the Japanese word for "dog"?

What kingdom would a human be in?

What "trapdoor" on your windpipe helps keep out food particles?

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

What is the correct plural of Keeshond?

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

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

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

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

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

Where does the zygote of a gymnosperm develop?

What type of creature generally lives on land but starts life in the water?

What is the human body's largest organ?

What makes up about 70 percent of most living things?

What process produces a duplicate of the original cell?

What arctic sea whale has one long horn on its head?

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