Answer:
A group of bacteria that accumulate in layers and secrete a protective extracellular material. (Option A)
Explanation:
Biofilm is defined as one or more types of microorganisms collectively grow in different places. Organisms that form the biofilm include protests, fungi, and bacteria.
Dental plaque is an example of a biofilm. It is a known buildup of slimy bacteria that forms on the teeth surface. Biofilm can grow on different surfaces such as animal tissues, plant tissues, minerals, metal, etc.
A strictly fermentative bacterium produces energy by glycolysis only.
From the options B is not part of the study of science is : ( B ) The ethics of new developments
Analyzing the evidence gotten from an experimental or research study is a core part of science because that way the scientist can determine if the results obtained are close to the predicted hypothesis or outcome.
Science involves the study of the natural world because all scientific experiments and researches are carried out by studying real life ( natural world ) as study cases. while the ethics of new developments is not controlled or determined by the scientist
Hence we can conclude that the ethics of new developments are not part of the study of science
Learn more : brainly.com/question/497944
B. The Threshold describes the minimum level of stimulus required to ctive a neuron. Hope that helps
