Certain bacteria live in the intestinal tract of other organisms. Which of the following statements describes how these microorganisms help maintain the health of other organisms? A) They produce antibiotics which destroy other microorganisms.
B) They decrease the amount of vitamins in the large intestine.
C) They purify food as it travels through the digestive system and remove contaminants.
D) They metabolize substances and break down food during digestion

Which of the following diseases may be transmitted through an accidental needle stick? a. syphilis b. tuberculosis c. cellulitis d. hepatitis b

Compare and contrast nutrient limitation in soil vs. nutrient limitation in aquatic ecosystems

Which of the following best describes the expensive tissue hypothesis? brains require more energy, so the gut had to be reduced, and larger brains and tool use led to higher quality diets. increasing body size means that homo neanderthalensis had to include more fat in its diet. brains require more energy, so the gut had to be reduced as brains got bigger. brains require more fat, so the gastrointestinal viscera (gut) had to expand, and hands were needed to acquire more food.