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Zina [86]
3 years ago
5

Why do you need only one polio vaccination, but a new flu shot every year?

Biology
1 answer:
nevsk [136]3 years ago
3 0

Answer:

The flu virus mutates

Explanation:

We need a new vaccine for each new strand of a flu virus

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Answer:

B ) Contain cells that connect to form pipes.

D ) Transport water and food.

Explanation:

Vascular tissue is a conducting tissue, meaning multiple cell types can be found. Their functions are to transport fluids and nutrients. To do this, they need cells that connect to form tube like pipes.

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Semisolid media such as MIO are used to determine motility. Another such medium such is SIM (sulfide, indole, motility) medium.
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