Spiders are ________
A) herbivores
B) filter feeders
C) carnivores
D) omnivores
C
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The medicinal leech, once used to withdraw "unhealthy" blood from patients, produces ____________ to ensure blood flow from the host?
A. antibiotics B. antibodies C. anticoagulants D. blood clots E. suture material
The total of all the resources, both biotic and abiotic, a species exploits for its survival, growth, and reproduction is its
A. food web. B. niche. C. biosphere. D. competitive zone. E. habitat.
Some scientists predict that as atmospheric carbon dioxide levels increase, plant growth will also increase. What is the best explanation for this hypothesis?
A. Plants release carbon dioxide into the atmosphere during respiration. B. Plants consume carbon dioxide from the atmosphere during photosynthesis. C. Plants consume carbon dioxide from the atmosphere during respiration. D. None of the answer choices is correct. E. Plants release carbon dioxide into the atmosphere during photosynthesis.
Using the illustration below and the assumption that
half of a plant’s sperm and eggs are a and half are A, one can predict that the chance of sperm a meeting egg A at fertilization is a. 1/2 x 1/2. b. 25 percent. c. one out of four. d. 1/2. e. all of these EXCEPT 1/2.