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Shkiper50 [21]
3 years ago
5

The primary focus of B-cell expansion forms in the _____, whereas a secondary focus of B-cell expansion creates the _____.

Biology
1 answer:
iren [92.7K]3 years ago
6 0
This is called immunology
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MULTIPLE CHOICE<br> How can a polar molecule be described?
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Answer:

where are the choices????

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3 years ago
Which of the following situations accurately describes a difference between a food chain and a food web? Select one:
Natasha2012 [34]
Lets look at your first question. A food chain is a linear (line) relationship between organisms. It shows who eats what and who gets eaten. The energy is passed up the chain from one organisms to the next. A food web is a series of interconnected food chains. It can show one organism being preyed upon by several predators. The answer choice A is really referring to an energy pyramid, but it is true in any ecosystem that only 10% of available energy is passed to the next trophic level. B and C are both true statements as well. D is completely false because 90% of energy is lost, not retained. So with that said, there is more than one correct answer here. I have included a diagram so you can see the difference between the two. 

For Question 8, the key to understanding this is that sunlight is the main source of energy for any ecosystem. Plants (autotrophs) use the sunlight to convert it to sugars (glucose) which is a compound that heterotrophs can utilize. This process is called photosynthesis. :-) 

Question 9: So in a food chain, you typically start with the producers (plants), then to the primary consumer, then secondary consumer, then tertiary consumer, and in some cases you may have a quaternary consumer. That is 4 links. However, we are forgetting the role of decomposers at all levels of this food chain, and that would add an extra link. In summary, you wouldn't typically see more than 5 links in a food chain. 

I hope all of my explanations are helpful! Good luck! :-) 

6 0
3 years ago
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What biome is treeless, has 2 seasons, has an average precipitation level of 6-10 in ( less than 25 cm) per year, and has an ave
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The answer is: C-Tundra
7 0
2 years ago
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A student measured the mass and volume of a metal sample using a triple beam balance and a graduated cylinder. The sample has a
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Answer:

d=3.79\ g/cm^3

Explanation:

Given that,

The mass of a sample, m = 16.7 grams

Volume of the sample, V = 4.4 cm³

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Density = mass/volume

Substituting all the values,

d=\dfrac{16.7\ g}{4.4\ cm^3}\\\\=3.79\ g/cm^3

So, the density of the metal sample is 3.79\ g/cm^3.

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2 years ago
Which statement best defines micronutrients
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a chemical element or substance required in trace amounts for the normal growth and development of living organisms.

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3 years ago
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