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

Which doctor or team of doctors is credited with pioneering the scientific study of human sexuality?

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

The brain is divided into how many lobes?

What openings in a leaf allow gas exchange?

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

Where does the zygote of a gymnosperm develop?

Where would you find the Nazca Lines?

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

What part of the brain controls hunger?

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

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

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

What kingdom would a human be in?

What does the substance melanin control?

What do conifers use to hold seeds?

What are chitterlings?

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

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

What part of the flower surrounds the inside parts of the flower?

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

With what process do living creatures make more of themselves?

What layer of the skin is just below the surface?

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

What makes up about 70 percent of most living things?