Question

fill in the blank question
the two major bacterial sources of antibiotics are the genera
and
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Explanation:

In the field of Biology (a subfield of Natural Science), the two major bacterial genera that are sources of antibiotics are Streptomyces and Penicillium (though Penicillium is a fungus, Streptomyces and Bacillus are major bacterial sources; commonly, Streptomyces and Bacillus are key bacterial genera for antibiotic production. Another common pair is Streptomyces and Pseudomonas, but the most well - known bacterial sources of antibiotics are the genera Streptomyces and Bacillus. For example, Streptomyces produces many antibiotics like streptomycin, and Bacillus species can produce antibiotics too.

Answer:

Streptomyces; Bacillus (or other correct bacterial genera pairs like Streptomyces and Pseudomonas, but Streptomyces and Bacillus are very common)