12.

How long has there been life on Earth?

Glycolysis is an anaerobic process used to catabolize glucose. what does it mean for this process to be an anaerobic?

The digestion of which food group may be affected by an inadequate amount of stomach acid?

Drag the tiles to the correct boxes to complete the pairs. Match the stages of the water cycle with the correct places in the model.

What is keratin and melanin and what are their function

What are seismic waves? What is their relationship to earthquakes?

What are the levels of biological organization from smallest to largest?

What area of a gene is a section of dna that carries the code used to make a protein?

Which of the following is not a limbic system structure

Which molecules are able to pass through the semi-permeable membrane

Match the term to its description. Match Term Definition Astronomical body A) A celestial object consisting of a nucleus of ice and a stream of gas and dust Galaxy B) A system of stars held by gravitational attraction Comet C) An object in space