________ competition results when nonterritorial behavioral interactions between two species result in negative effects on both species
Fill in the blank(s) with correct word
Encounter
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In streams and rivers, most of the microbial biomass is ________.
A. metabolically inactive B. floating on the surface C. buried in bottom sediments D. attached to surfaces
Which discovery supports the hypothesis that evolution of the lactase-persistence trait was driven by the use of milk in pastoralist cultures?
A. The lactase gene is present both in humans and in domesticated animals B. Ancient pots used to hold milk are about the same age as the lactase persistence mutations. C. Most human cultures today drink milk and most people worldwide are lactase persistent. D. Scientists have identified different mutations that cause lactase persistence.
Which of the following choices lists the organs of the human alimentary canal in the CORRECT order?
A) pharynx, oral cavity, esophagus, stomach, large intestine B) oral cavity, pharynx, esophagus, stomach, small intestine, large intestine C) esophagus, pharynx, stomach, large intestine, small intestine D) oral cavity, esophagus, stomach, large intestine, small intestine
Which hormone causes calcium to be released from bone into the bloodstream?
A) Boniva B) estrogen C) parathyroid hormone (PTH) D) calcitonin