Some ways in which communicable diseases spread are by: physical contact with an infected person, such as through touch (staphylococcus), sexual intercourse (gonorrhea, HIV), fecal/oral transmission (hepatitis A), or droplets (influenza, TB) travel through the air, such as tuberculosis or measles.
Nearly all life on Earth ultimately gets its energy from the sun, which gets "its"energy through nuclear fusion. <span>With the exception of hydrogen, all of the chemical elements needed for life were produced by nuclear fusion of lighter elements, either in the cores of stars or in the shock waves of supernova explosions.</span>
Answer:
retroviruses
Explanation:
Retrovirus have an enzyme known as reverse transcriptase which allows them to synthesize DNA from RNA going against the central dogma of life which is the synthesis of RNA from DNA. This phenomenon is called teminism.
Answer:
Obligate anaerobes (Ans. D)
Explanation:
Gas gangrene is a bacterial infection which produces tissue gas in gangrene. This is caused by bacteria <em>Clostridium perfringens</em><em>. Clostridium perfringens</em> is a gram-positive, obligate anaerobic bacterium of the <em>Clostridium</em> genus. It is found in environmental sources & commonly found in raw meat and poultry.
Tetanus is a bacterial disease infected by <em>Clostridium tetani</em>, is an obligate anaerobic spore-forming bacteria. It is found in soil, dust and intestinal tracts of animals. Transmission of tetanus is commonly by contaminated wounds.
