Across
- 4. a red protein responsible for transporting oxygen in the blood of vertebrates.
- 7. any of a large group of organic compounds occurring in foods and living tissues and including sugars, starch, and cellulose.
- 10. the energy needed to raise the temperature of 1 gram of water through 1 °
- 12. any of a class of nitrogenous organic compounds that consist of large molecules composed of one or more long chains of amino acids and are an essential part of all living organisms, especially as structural components of body tissues such as muscle, hair, collagen, etc., and as enzymes and antibodies.
- 14. any of a group of organic compounds that are essential for normal growth and nutrition and are required in small quantities in the diet because they cannot be synthesized by the body.
- 17. in good health.
- 18. light from the sun
- 19. each of a pair of organs in the abdominal cavity of mammals, birds, and reptiles, excreting urine.
Down
- 1. not previously known or used; new or different.
- 2. a sweet crystalline substance obtained from various plants, especially sugar cane and sugar beet, consisting essentially of sucrose, and used as a sweetener in food and drink.
- 3. the chemical element of atomic number 19, a soft silvery-white reactive metal of the alkali metal group.
- 5. a chemical element or substance required in trace amounts for the normal growth and development of living organisms.
- 6. relating to, or derived from living matter.
- 8. a colorless, transparent, odorless, tasteless liquid that forms the seas, lakes, rivers, and rain and is the basis of the fluids of living organisms.
- 9. a natural oily or greasy substance occurring in animal bodies,
- 11. stiffen (fabric or clothing) with starch.
- 13. the natural agent that stimulates sight and makes things visible.
- 15. a substance that provides nourishment essential for growth and the maintenance of life.
- 16. the colorless fluid part of blood, lymph, or milk, in which corpuscles or fat globules are suspended.