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shtirl [24]
3 years ago
12

In 2009, the h1n1 influenza virus caused illness around the world. an h1n1 virus was also responsible for the 1918 influenza epi

demic, as well as an influenza outbreak in 1976. some people who were born before 1953 were found to have some immunity to the 2009 h1n1 virus. how could they have obtained this immunity?
Biology
2 answers:
Lelechka [254]3 years ago
5 0
<span>They could have obtained it because in 1953 they were probably more healthy. Their immune systems were not so exposed to processed foods or so many human made sicknesses. However the 1918 epidemic might have gave a boost to self-protect the ones that were not affected.</span>
Goryan [66]3 years ago
5 0

Answer:

Spread of the 2009 H1N1 virus is thought to occur in the same way that seasonal flu spreads. Flu viruses are spread mainly from person to person through coughing, sneezing or talking by people with influenza. Sometimes people may become infected by touching something – such as a surface or object – with flu viruses on it and then touching their mouth or nose.

Explanation: trust me i tried both

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Pyramids depicting the number of organisms or biomass may be inverted, upright, or even diamond-shaped.
Delicious77 [7]

Answer:

The correct answer is - as energy lost at every trophic level.

Explanation:

In any ecological ecosystem the energy pyramids always upright unlike other pyramids such as biomass showing the number of organisms, that can be diamond shape, inverted or upright.

The main reason behind this is due to the fact that it is only a pyramid in the ecosystem that always unidirectional in the food chain which is always some energy lost with an increase in the trophic level in the food chain. This loss of energy always gets back to the atmosphere in each step of the food chain.

3 0
3 years ago
These photosynthetic protists produce one third of the Earth’s oxygen that is generated through photosynthesis.
Art [367]

Answer:

A

Explanation:

this is because these photosynthetic protists have chlororphyll which is capable to make their own food materials through photosynthesis

6 0
3 years ago
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Explain how the structure of a cellulose molecule relates to the molecules function please?
S_A_V [24]
The molecule is formed from glucose, which fits together nicely and becomes sturdy. It relates to the function of the cellulose model because it aids in strength and structural support.
5 0
3 years ago
Read 2 more answers
7. Explain at least two ways in which wind pollinated plants' structures are
Veronika [31]

Answer:

Wind pollinated have light and small pollen grains to be easily carried away. They also lack petals or have small ones, so that the pollen can be exposed and easily swept by wind.

7 0
3 years ago
If nothing ever eats a shark, what will eventually happen to the energy that is stored in its body?
saul85 [17]

Answer:

It will remain a part of the environment

Explanation:

Energy cannot be destroyed but can change from one sate to another. Usually in a food chain animals eaten and the energy is passed from one animal to the next. In the case of larger animals the energy is only made available is they pass away or lose an appendage such as a tooth or antlers, that other animals can feed on.

If a shark is not preyed on and remains in the ecosystem, it's energy will not be cycled but this animal will get larger and larger.

Should a shark pass away and nothing feeds on it there are two things that will happen:

  1. Energy will be stored and the animal will eventually become volatile or slowly disintegrate and the energy will be released from the atoms and molecules when the bonds are eventually broken by chemical reactions brought on by the environment (sun. wind, currents, etc).
  2. The animal will eventually solidify and may turn into stone. The energy will be locked into the animal and will be encased and become a part of the substrate

It is not likely that a shark will keep it's energy and not be eaten by other animals after death but on the chance that it does it may slowly disintegrate or become solidified.

5 0
3 years ago
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