Feeding levels in an ecosystem are also known as
a. nutritional levels.
b. nourishment levels.
c. trophic levels.
d. niche levels.
e. biome levels.
C
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Staphylococcus aureus is a common foodborne disease, because it
A) grows on common foods. B) is present in some humans that work in food processing. C) produces several heat-stable enterotoxins. D) grows on many foods, is present in some humans that work in food processing, and produces several heat-stable enterotoxins.
The ancestors of modern ________ performed the oxygenic photosynthesis responsible for converting our anoxic planet to an oxygenated one.
A. Firmicutes B. Proteobacteria C. Cyanobacteria D. Crenarchaeota
What is the most abundant tissue type in the
human body?
a. connective b. muscular c. epithelial d. neural e. adipose
Electrical signals are converted into chemical signals at the end of a(n) _____
a. neuroglial cell b. muscle cell c. microvillus d. neuron cell body e. axon