What kind of virus caused the 1918 pandemic?

Answers

Answer 1

Answer:

The answer is Spanish flu

Answer 2

Answer:

H1N1 virus with genes of avian origin

Explanation:

The outbreak was caused by an influenza type, where the subtype of it is know as H1N1 virus.(. Characterization of five of the eight RNA segments of the 1918 influenza virus indicates that it was the common ancestor of both subsequent human and swine H1N1 lineages, and experiments testing models of virulence using reverse genetics approaches with 1918 influenza genes have begun in hopes of identifying genetic features that confer virulence in humans..... EXTRACTED FROM A TEXT FOR MORE INFO)


Related Questions

I've been looking around for the answer in this interactive website that was included within to answer these questions but, I couldn't find it and I'm wasting time looking for it.

Answers

Answer:

Iron is what mercury is mostly made of

Will give brainlist!!!!! 20 points!

Question 1:
Changes in the chemical composition of the atmosphere that may produce acid rain or most closely associated with
A. Insects that excrete acids
B. Industrial smoke stack emissions
C. Flocks of migrating birds
D. Runoff from acidic soils

Question 2:
Acid rain contributes to all of the following except:
A. Damage to vegetation
B. Loss of biodiversity in aquatic ecosystems
C. Smog
D. Advance chemical weathering

Answers

Answer:

1 d

2 c

Explanation:

brainliest?????

Answer:

D and C

Explanation:

Help me past due Write down what you think will happen to the density of water if you add salt or sugar.

Answers

Answer:

If I add sugar or salt, the water's density will increase.

Explanation:

Density is the relation between mass and volume. We can represent it with the formula δ= m/v. Where δ stans for density, m for mass,  v for volume.

If we add salt or sugar, we increase the mass, but the volume is the same. As a result, the density will increase.

We can use numbers to understand it better.

Suppose that before adding salt or sugar, the mass is 1 g and the volume is 1 l

δ= 1g/l1t

δ= 1 g/lt

Now, if we add sugar or salt, the mass increases. Suppose that we have 2g of mass and the volume is the same, 1l.

δ= 2g/1lt

δ= 2g/lt

We can see that the density increased when the mass increased.

Which of the following accurately describes a trade-off of using a reusable
cloth bag instead of a plastic bag?
A. You have to store the cloth bags and remember them when you
go shopping
B. Plastic bags are recyclable, whereas cloth bags are not.
C. You are saving the oil required to produce plastic bags.
D. You are giving up a little bit of convenience in exchange for
environmental friendliness.
HELP PLEASE

Answers

answer: the answer is d

Using the allele symbols in the table, identify the genotype of a guinea pig that is recessive for hair length, heterozygous for hair color, and homzygous dominant for hair texture.

Answers

Answer:

Hair length: hh

Hair color: Bb

Hair Texture: RR

Explanation:

In order for the recessive gene to show for hair length, two of the same alleles must be present, so, in this case, hh.

The question states "heterozygous for hair color." This tells you that the genotype will be Bb. Heterozygous means two of the different alleles. This is different from homzygous.

The question states "homzygous dominant for hair texture." This tells you that it will contain two of the same alleles. The question also tells you that it is homzygous dominant, which means there will be two of the same dominant alleles, so, RR.

How is efficiency related to systems?

Answers

The efficiency indicates the manner in which the inputs are used by the system. Being efficient means the system uses inputs in a `right' way. If the input-output ratio is adverse, we say that the system is inefficient though it produces the desired output.

Refer to Figure 12-2. Which of the following is the series of amino acids encoded by
the piece of mRNA: AUG UCU UGC
A
val-ser-leu
B
meth-ala-leu
с
thre-leu-gly
D
meth-ser-cys

Answers

Answer: D

Explanation:

Okay so look at the diagram. Start from the middle and work your way out.

AUG: I find A in the middle (the first four) and then go to the part of the diagram that has U right under the last letter you had, so A. And do the same for U, and you should get methionine.

Repeat this process for the other two.

Explain why a topographic map has a key.

Answers


Topographic maps represent the locations of geographical features, such as hills and valleys. Topographic maps use contour lines to show different elevations on a map. A contour line is a type of isoline; in this case, a line of equal elevation. If you walk along a contour line you will not go uphill or downhill.

Topographic maps represent the locations of geographical features, such as hills and valleys.

What do you mean by topographic maps?

Topographic maps use contour lines to show different elevations on a map. A contour line is a type of isoline; in this case, a line of equal elevation.

In modern mapping, a topographic map or topographic sheet is a type of map characterized by large-scale detail and quantitative representation of relief features, usually using contour lines.

A topographic map is a detailed and accurate illustration of man-made and natural features on the ground such as roads, railways, power transmission lines, contours, elevations, rivers, lakes.

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The nervous system is the major ______ system of the body.
A. output
B. control
C. transport
D. protective

Answers

Answer:

B. Control

Explanation:

control system of the body

all plant bodies(root,stem and leaf) are externally covered by epidermis but why woody plant is covered by barks​

Answers

Answer:

Bark comprises all the tissues surrounding the xylem in woody plants. Broadly, bark includes an inner and mostly living region and an outer, dead one. Of all plant structures, bark has the most complex anatomical structure and ontogenetic origin involving two (and often three) different meristems.

As to why, the bark adds layers to the inside ring of the vascular cambium, the outside is pushed outward. The cells die off, and the fibrous matrix of cellulose and lignin molecules remain. This hard structure forms the bark, and protects the tree or plant from many forms of damage.

Hormones for glucoregulation are secreted by a gland called??

HELP ASAP PLZ

Answers

Answer:

Pancreas ( ilets of Langerhans)

Explanation:

fossils of marine organisms hi in the Andes mountains lead Darwin to conclude that???

Answers

Answer:

its C

Explanation:

the answer is c, great geologic change can happen over long periods of time

GIVING AWAY 14 POINTS PLEASE HELP ME ON THIS QUESTION ASAP!!!!

Answers

Answer: i think its B or C

Answer: B

Explanation: Hope this help :D

Over time, data that support the successful evolution of a species would include observations that describe

Answers

More body cells and more genetic changes happening


Can you please help me with this...

Answers

Answer:

A. Asexual

Explanation:

I majored in Biology

100 points (50 each) How do workers decide when to set a controlled burn, and how do they know if they have been successful?

Answers

Answer:

It is very important to have the latest and most updated weather conditions available before starting the burn. Relative humidity is an important factor to consider when planning a controlled burn. If the relative humidity is below 50%, the dryness of the grass is prone to causing very hot fires

What would happen to zygote if the egg and sprem cells weren't formed with the correct number of chromosomes?

Answers

Answer:

A zygote can end up with one fewer chromosome than normal because one of the fertilizing gametes was missing a chromosome. This deletion, called nondisjunction, happened while the gamete was forming.

Explanation:

Small frogs living in a marshy region feed on small insects in the region. The relationship between the frogs and insects is a relationship.

Answers

Answer:

Parasitism

Explanation:

This is because parasitism is a type of relationship that exist between organisms where one which is the predator feed on the prey thereby causing harm or injury or death to the prey. In the question, small frogs are the predators and insects are the prey, therefore the predators cause harm to the prey, meaning they only benefits from the farm they cause the prey.

What is true about a trophic level in an ecosystem?
Select all that apply
The amount of energy flowing into secondary consumers must equal the
amount that flows into primary consumers.
The ecosystem is an isolated system.
The ecosystem is an open system
The amount of energy flowing into the secondary consumers is less than
the amount that flows into the primary consumers.

HHEELLPPPHHH

Answers

The amount of energy flowing into secondary consumers is less than the ambit that flows into the primary consumers, and the ecosystem is an open system are true... I think

50 points welp
Mums are plants that bloom in the fall.

Which statement describes the photoperiodism of mums?

They bloom when the days are longer.
They bloom when the nights are longer.
They bloom when the temperatures are warmer.
They bloom when the temperatures are colder.

Answers

Answer:

They bloom when the nights are longer.

Answer:

2. They bloom when the nights are longer

Explanation:

Photoperiodism means the reaction to length of a day or night cycle, since fall is the beginning of shorter days and longer nights, it is only reasonable that the answer is that They bloom when the nights are longer.

All of the following are used by taxonomists to create evolutionary links between species EXCEPT
Select one:
a. analogous structures
b. the fossil record
c. molecular data
d. vestigial structures

Answers

A Analogous structures

The fossil record, molecular data and vestigial structure would help taxonomists to create evolutionary links between species except analogous structures.

What do you mean by fossil record?"A fossil record is a group of fossils which has been analyzed and arranged chronologically and in taxonomic order."What is molecular data?"Molecules such as sequence of DNA used in studies of intra-specific variation and studies of similarity among species."What is vestigial structure?"Structures that have no apparent function and appear to be residual parts from a past ancestor are called vestigial structures."What do you mean by taxonomists?"Taxonomists are professionals who specialize in classifying and sorting information based on similar characteristics and patterns."What are analogous structures?The structure of different species performing similar function but are from different origin (do not have common ancestor).

The fossil record, molecular data and vestigial structure all would help taxonomists to find evolutionary links between species where through  analogous structures no links would be created.

Hence, the correct option is a. analogous structures.

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1. Which statement is true about how early humans met their needs?

A)The first humans moved around a lot looking for food.

B)The first humans hunted in the winter but grew crops in the summer.

C)The first humans stayed in one place and raised animals for food.

D)The first humans stayed in one place and grew crops.

Answers

Answer:

A)The first humans moved around a lot looking for food.

Explanation:

just took test

The true statement about how early humans met their needs is : ( A ) The first humans moved around alot looking for food .

Way of life of Early humans

In order to survive early humans moved around like nomads in search of food and shelter most of the times because there was no formal or mechanized way of cultivating agricultural products for food.

As humans continued to advance in knowledge they started farming and rearing of animals but these were not done by early humans.

Hence we can conclude that The true statement about how early humans met their needs is : ( A ) The first humans moved around alot looking for food .

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One partner in a sexual relationship has HIV. How can the couple prevent the other partner from contracting HIV?

Answers

Answer:

using a condom

Explanation:

Please Help! In what areas of New Zealand might you expect to find compression? Explain your answer.

Btw I don't want any links for the answers!​

Answers

Answer:

The Pacific Plate is colliding with the Australian Plate at a rate of about 40 mm/yr. The East coast of the North Island is being compressed and lifted by this collision, producing the North Island and Marlborough Fault Systems.

Explanation:

Match the position to the closest estimation of its current career outlook.
agricultural engineer
landscape architect
agricultural managers
loss of more than 5 percent
:: growth of more than 15 percent
growth of less than 10 percent

Answers

Answer:

can you rephrase your question im not understaind it, if you can i can answer it for you

Explanation:

how humans changed the balance of the park ecosystem.

Answers

Answer:

Changing the environment can upset the balance in ecosystems.

Explanation:

Why is it important that the seedling’s true leaves grow quickly?HURRY IM BEING TIMED

to help disperse seeds to areas where they can grow
to shield the seedling from too much water or rain
to protect the seedling from receiving too much sunlight
to make food for the seedling’s continued growth

Answers

Answer:

The correct answer is - to make food for the seedling’s continued growth.

Explanation:

The true leaves that emerge from the seedlings are the leaves that are capable of performing photosynthesis and start generating food and energy. These support the plant for the rest of its life in terms of food and energy.

Seedlings grow from the soil, two leaves in beginning called cotyledons that are not the true leaves and not able to perform photosynthesis and generate their food for the seedling’s continued growth.

Please help me I will mark BRAINLIEST

Answers

Answer:

D

Explanation:

Answer: I think its c

The crust is the thickest layer of the earth true or false​

Answers

Answer:

The crust is not the thickest layer of earth

:)

Answer:

No

Explanation:

The core is the thickest layer of the earth! Which the crust is relatively thin compared to the other layers

The ultimate goal of sustainable development is to _______. a. limit the future use of resources b. meet current and future resource needs c. increase the current use of resources d. reduce resource use but increase supplies Please select the best answer from the choices provided A B C D

Answers

Answer:

share benefits equitably for improved quality of life.Explanation:

The ultimate goal of sustainable development is to meet current and future resource needs. Therefore, the correct option is B.

What is sustainable development?

Sustainable development is the concept of meeting the demands of the present generation without compromising the ability of future generations to meet their own needs. It is a strategy to achieve economic growth and expansion while safeguarding social welfare, environment and both.

The idea of ​​sustainable development acknowledges the interdependence of economic, social and environmental problems and the need to address them all simultaneously. Sustainable development aims at striking a balance between economic expansion, resource conservation and environmental protection. Additionally, it strives to advance social justice and raise the standard of living for all. Meeting current and future resource needs is the ultimate goal of sustainable development.

Therefore, the correct option is B.

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