A collection of organisms, together with the physical and chemical factors in their environment, are called a(n) ________.
A. ecosystem
B. atmosphere
C. lithosphere
D. biosphere
E. hydrosphere
Answer: A
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Male redback spiders benefit when they are eaten by their mates because
A. they ultimately have higher reproductive success. B. they are only partially eaten and can regrow lost parts. C. they would die soon after copulation anyway. D. they don't have to fight other males. E. None of the answer choices is correct.
________ is a hormone secreted by the cells in the stomach lining that functions to increase release of gastric juices
Fill in the blank(s) with correct word
Oxygen gas produced during photosynthesis originates as:
a) oxygen atoms contained in water molecules. b) oxygen atoms from a molecule of chlorophyll that is oxidized by a photon. c) oxygen atoms released by the metabolism of carbohydrates. d) oxygen molecules in the atmosphere. e) oxygen atoms contained in carbon dioxide are released when the carbon is fixed.
Bacillus licheniformis secretes a compound that inhibits the growth of other Gram-positive bacteria. This is an example of a(n)
A. analog. B. antibiotic. C. chemotherapeutic. D. porin. E. toxin.