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olchik [2.2K]
3 years ago
12

Compared to today, the treatment of breast cancer in the 1960s, typically:

Biology
1 answer:
Vaselesa [24]3 years ago
8 0
In the late 1950's - 1960's survival from cancer was poor. Damaging surgery and relatively unsophisticated radiotheraphy were the main treatments. Understanding of cancer treatment has transformed over 60 years. The arrival of chemotheraphy, and solid evidence for the link between cancer and factors such as smoking or viruses. 
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When amylase break down starch what sugars are produced??
netineya [11]

Answer:

Hi there!

When amylase breaks down starch they form simple sugars, or disaccharides and trisaccharides which are converted by other enzymes to glucose to supply the body with energy.

4 0
3 years ago
PLEASE HELP ME ASAP GIVING AWAY 14 POINTS!!!!!!!!!!!!!!!
meriva

Answer:

its b sunlight

Explanation: because why would a plant grow according to pressure gravity or touch.

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2 years ago
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Cardiac muscle does not exhibit tetanus beacuse it has A. exclusively aerobic respiration. B. fast Ca2 channels. C. a long absol
Nina [5.8K]

Answer:

C, a long absolute refractory period.

Explanation:

Tetanus is not possible in cardiac muscle tissue because cardiac cells have longer action potentials and a very long refractory period compared to other cells. This helps prevent the heart from cramping and seizing up.

5 0
2 years ago
Which answer best defines what the Lotka-Volterra predator-prey model mathematically describes?-The competition among many preda
yanalaym [24]

Answer:

The simultaneous effect of a predator population on a prey population and a prey population on a predator population over time.

Explanation:  

The mathematical models of Lotka-Volterra equations explain the existing interaction between species in which prey and predator influence and affect each other. The model follows a few assumptions,    

  • The ecosystem is isolated and closed. There is no migration.
  • The whole individuals are reproductively equivalent.
  • In the absence of the predator, prey shows an exponential growth rate. The prey is in the ideal environment.  
  • When there is no prey, the predator population decreases exponentially because of the lack of food. The predator environment is ideal, but it is limited by prey density.  
  • The predation rate is proportional to the encounters rate, which also depends on density.  
  • The predators affect the prey populations, inducing its decrease proportionally to the number of prey and predators present.  
  • The prey population also influences the predator population proportionally to the number of encounters between the two species.  

In these equations, the variable D is the number of predators, and P the number of prey items.

The parameters are always constant:  

• r1: prey growth rate.  

• a1: predator hunting success.  

• r2: predator growth rate.  

• a2: the success of the predator in hunting and feeding.

In nature, many factors affect interactions, such as dense-dependent factors and dense-independent factors. Also, in reality, there are stochastic factors. Stochasticity refers to the variability in the system involving those factors that are affecting or influencing population growth. Stochasticity might be related to good years and bad years for population growth.

In real situations, the compliance of the whole assumption does not occur. The previously mentioned constants might vary, constantly changing the interaction between the predator and the prey. These parameters change in different degrees, resulting in varying circumstances for both species.

3 0
3 years ago
2. What are the limitations of the geocentric model that led to the creation of the heliocentric
kirill115 [55]

Answer:

The model cannot explain why planets appear to go backward and make loops in the sky. Explanation: As an example, the observation of the planet Mars shows that there are times where it seems to be moving forward at first, then back, and then forward again

Explanation:

3 0
3 years ago
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