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Llana [10]
3 years ago
7

In 2009, h1n1 flu caused many cases of flu around the world. Research how h1n1 flu differs from the 1918-1919 flu.

Biology
1 answer:
RUDIKE [14]3 years ago
3 0
Flu (influenza) viruses are divided into four broad categories: influenza A, B, C or D. Influenza A is the most common type. H1N1 flu is a subtype of influenza A.

Subtypes of influenza A are categorized based on two proteins on the surface of the virus, hemagglutinin (H) and neuraminidase (N). There are many H and N subtypes, and each one is numbered. All H and N flu subtypes are influenza A viruses.

Each influenza subtype has many different strains of influenza virus. Not all strains infect people. Subtypes of influenza A viruses currently found in people are strains of H1N1 and H3N2. Each year's flu vaccine includes varieties of both of these strains and influenza B.

i hope this helps. please mark brainliest if it does :)
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Explanation:

circadian rhythms are behavioural changes that respond to light and darkness in an organisms environment. The sleep-inducing wake cycle is a good example of a circadian rhythm. In the experiment, the disruption of the mouse SCN led to development of imbalances in the circadian rhythm of sleep and wake cycle leading to falling asleep and waking up at random times of the day and night. I hope this helps. Thanks

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dlinn [17]

Answer:

well really it's all of them except D. and i think this should serve as a reminder to help protect are environment and have a great day

6 0
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