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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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An example of a secondary consumer is a _________.
erastovalidia [21]
A panther because it eats the primary consumer which would be the deer.
an oak tree is the producer (bottom of the food chain)
the deer is the primary consumer because it eats grass which would also be a producer
and the hawk would be the top predator because it eats a snake which would eat a mouse which would feed on a producer :)
6 0
3 years ago
Water is known as the universal ______ because it dissolves so many different substances
cricket20 [7]
It's the universal Solvent 
8 0
3 years ago
Read 2 more answers
Starch and _____ are common polysaccharide carbohydrates found in plants.
uysha [10]

Answer: Cellulose

Explanation:

Starch and cellulose are they two primary polysacharride found in plants.

Starch is the storage polysacharride found in plants in consisting of both linear chain amylose and branch chain amylopectin.

While Cellulose is the structural polysacharride in cell wall of plants. Cellulose consist of a linear chain of thousands of D-glucose units linked together by beta linkages.

4 0
3 years ago
______ energy is converted into________ energy during the process of_________
bezimeni [28]

Answer:

LIGHT ENERGY is converted to CHEMICAL ENERGY in the process of PHOTOSYNTHESIS

Explanation:

According to the law of conservation of energy, energy cannot be created nor destroyed but can only be changed from one form to another. This means that no form of energy gets destroyed but only transformed. This is evidently so in so many natural processes including the process of PHOTOSYNTHESIS undergone by plants.

Photosynthesis, which is the way plants obtain their food via sunlight, converts the LIGHT ENERGY of the sun to CHEMICAL ENERGY in glucose produced. Hence, photosynthesis obeys the law of conservation of energy.

7 0
3 years ago
The picture represents gas exchange in the alveoli. Observe what is happening at location X.
aivan3 [116]

A

CO₂ is the waste product of respiration of cells. Oxygen, on the other hand, is required in cellular respiration. Therefore at the alveolar in the lungs of an organism, CO₂ will be expelled while O₂ will be taken in.

Explanation:

This occurs passively due to the diffusion gradient, CO₂ usually has a higher concentration in the blood and lower concentration in alveoli hence this gas diffuses from the bloodstream into the lungs. On the other hand, oxygen is higher in concentration in the alveoli than in the blood capillaries hence difuses into the blood and taken to the cell for respiration. The CO₂ in the lungs is then expelled through exhalation of the lungs.

Learn More:

For more on gaseous exchange in the lungs check out;

brainly.com/question/12891596

brainly.com/question/2126516

brainly.com/question/12469601

brainly.com/question/2698578

#LearnWithBrainly

5 0
3 years ago
Read 2 more answers
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