A) fatty acids B) monosaccharides. C) nucleotides. D) amino acids. 8) Through di

Question

A) fatty acids B) monosaccharides. C) nucleotides. D) amino acids. 8) Through digestion, nucleic acids are broken down into A) fatty acids. B) monosaccharides C) glycerols. D) nucleotides. 9) Which of the following organisms has a gastrovascular cavity? A) hydra B) dog C) cow D) bird 10) An animal digestive tract that consists of two openings (a mouth and anus) is called A) an excretory system. B) the alimentary canal. C) the digestive enzyme center. D) a mammalian crop 11) An alimentary canal is best defined as A) the compartment in which an animal temporarily stores its food. B) a digestive cavity in which food is churned and mixed. C) a tube-shaped compartment for the transport, digestion, and absorption of food. D) an organ designed for chemical breakdown of food particles 12) The main function of an earthworm's gizzard is to A) moisten food. B) store food. C) digest vitamins. D) grind food. 13) High-flying birds are able to obtain enough oxygen even when the air is very thin because A) they have more efficient lungs than other vertebrates. B) they have reduced amounts of hemoglobin in their blood. C) their mitochondria are more efficient than those of other vertebrates. D) they are able to store oxygen in oxygen chambers within muscle cells. 14) If you were to move from around sea level to a much higher altitude, your body would res A) profuse sweating. B) a decrease in the diameter and number of capillaries close to your body's surface. C) an increase in energy production.. D) an increase in the number of your red blood ells. 15) The reason animals need a continuous supply of oxygen is to A) make carbon dioxide. B) synthesize protein C) dispose of carbon dioxide. D) obtain energy from their food.

Explanation / Answer

8.D. nucleotides

9. A. hydra

10. B. alimentary canal

11. C. a tube shaped compartment for the transport, digestion and absorption of food

12. D. grind food

13. A. because they have more efficient lungs than other vertebrates

14. D. an increase in the number of red blood cells

15. D. obtain energy from food

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