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denis23 [38]
2 years ago
8

How effective was Jonas Salk’s initial testing of the polio vaccine?

Biology
1 answer:
leva [86]2 years ago
6 0

Answer:it was very effective.

Explanation:

According to report in America 1954, Salk conducted a national study, with over a million paediatric subjects wish yielded a positive outcome and on 12 April 1955, the vaccine was considered safe and efficacious. in 1955, the vaccines was used for over 29,000 cases of poliomyelitis in the US and the infection rate reduced to less than 6,000. This made Salk vaccine more recognized and it was speedily adopted worldwide reaching almost 90 countries in less than 2 years after it mass production.

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23. Economic systems_____
stealth61 [152]

Answer:

Option A

Explanation:

Most of the human economic systems if not all operate with the human natural systems. Human economic system and natural systems almost dependent on one another in that they are linked by a network of interconnected  processes; for example, human economic activity depend on natural, including a maintained system of primary productivity such as forests and agriculture etc.

8 0
3 years ago
What is the main purpose of mitosis? A. to help the cell grow larger B. to divide the cytoplasm C. to separate sister chromatids
denis23 [38]
I think its C. This is because your making two cromatited pairs when doing the process and then pulled apart to make two daughter cells. apart It's not D because that's what raication is. Its not A because your dividing the cell in to two more cells. It's not B because you can't really divide the cytoplasm.
8 0
3 years ago
Which of the following statements about the Canadian charter of rights and freedom is true
MAXImum [283]
Where are the options?
7 0
3 years ago
A typical fungi thallus includes many filamentous BLANK-1 that combine to form a BLANK-2 that grows underground, and produce a B
vitfil [10]

Answer:

hypha

mycelium

fruiting body

spores

Explanation:

<em>A typical fungi thallus includes many filamentous hypha that combine to form mycelium that grows underground, and produce a fruiting body reproductive structure that produce spores that disperse on the wind to new habitat.</em>

Fungi body are generally made up of hypha, a network of which forms the mycelium. The mycelium grows underground within the substrate and occasionally bring out fruiting bodies which bear the sporangium containing the spores. The spores act as agent of dispersal and are used to form new organisms when the conditions are right.

3 0
3 years ago
What surrounds the cell and controls the movement of substances in and out
Nonamiya [84]

Answer:

The plasma membrane is made up by a phospholipid bilayer with embedded proteins that separates the internal contents of the cell from its surrounding environment. Only relatively small, non- polar materials can easily move through the lipid bilayer of the plasma membrane.

Explanation:

7 0
2 years ago
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