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Soloha48 [4]
3 years ago
13

Why do you think death rates were so high?give two reasons

Biology
1 answer:
densk [106]3 years ago
7 0

Answer:

In 1900, the annual mortality rate was one in 42 Americans. ... 8556), co-authors David Cutler and Ellen Meara explore how we achieved such gains in health: that is, ... In the next two decades, life expectancy improvements were split relatively ... Infectious diseases were the leading cause of death in 1900, accounting for 32 ...

Explanation:

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What are the pores in a leaf called and what is their purpose
Katyanochek1 [597]

Answer: Helps the plant breathe: The epidermis of the leaf contains guard cells that control and regulate the small pores on the undersurface of the leaves. These pores are called stomata. Stomata are responsible for regulating water in and out of the cell. It is also responsible for the exchange of gases across the epidermis.

8 0
3 years ago
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The pancreas produces all of the following digestive enzymes except:
ryzh [129]

Answer: the answer is C

Explanation:

Pancreatic proteases (such as trypsin and chymotrypsin) - which help to digest proteins.

4 0
2 years ago
Explain the interaction that occurs between a t-helper lymphocyte and a b cell when the b cell is being induced to produce peanu
Paraphin [41]

Answer:

           According to Dr. Ray Schiling (member of the American Academy of Anti-aging medicine) about 1.5 million people suffer from peanut allergies. The seeds of peanut (<em>Arachis hypogea</em>) contain an array of allergens that can induce the production of IgE specific antibodies predisposed individuals. Ara1 and Ara2 are most common seed storage protein that cause allergy. Other allergen proteins such as Ara3 to Ara 17 have also been identified that cause allergy.  


Entry of peanut allergen into body

When peanut allergens enter the body of an individuals it leads to development of different symptoms like itchy skin, tingling sensation, nausea, runny nose and anaphylaxis.  

Allergic response

There are two subsets of T-cells Th1 and Th2. Both invoke different response to allergens. Th1 direct a non-allergic response while Th2 direct allergic response ranging from releasing of histamine to anaphylactic response. The presence of IL-12 cytokines direct a Th1 based, nonspecific response.  


Mechanism of allergic response (interaction between helper T cell and B cell)

Step 1.  

           When allergen enter to body they are encountered by B cells. Immunoglobulin receptors on the surface of B cells recognize antigen (Peanut allergens) and get attached, which are then internalized and processed. Within B cells the fragments of antigens combine with HLA class 2 proteins.  

Step 2

             HLA class 2 with antigen fragments (peanut allergens) then display on the surface of B cells.

Step 3

            Receptors on the surface of helper T cells recognizes the complex of HLA class 2 and antigen fragments (peanut allergen) and is activated to produce cytokines, which activate the B cells.  

Step 4

             B cell is activated by cytokines and begins clonal expansion. Some of the progeny become anti-body producing plasma cells while other become memory B cells.  


7 0
3 years ago
Jonathan wants to study the effects of warm and humid weather on plants found on the southeastern coast of the United States. Wh
Anastasy [175]
He will encounter maritime tropical
7 0
3 years ago
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In mitosis or a single cell, the nucleus
vazorg [7]

Answer:

celula

Explanation:

8 0
2 years ago
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