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frez [133]
3 years ago
11

21. Cells of the immune system are able to respond to the presence of

Biology
1 answer:
ratelena [41]3 years ago
8 0

Answer:

1.  antigens present on the invaders

Explanation:

Through the antigens present to the invaders the Cells of the immune system can easily able to respond and recognize.  During an infection, chemical signals attract phagocytes to places where the pathogen has invaded the body. 

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What is the result of dissociation of water? a) Formation of O-2 ions b) Formation of H+ and OH- ions c) Formation of H- and OH+
kati45 [8]
I think the correct answer from the choices listed above is option C. The result of the dissociation of water is  the formation <span>of H- and OH+ ions. This process is reversible which means that it could form back to water. Hope this answers the question. Have a nice day.</span>
4 0
3 years ago
Distinguish between directional, stabilizing, and disruptive selection. Give examples.
Pepsi [2]
Distribution of phenotypes within a population may be impacted by different types of natural selection. These types of selection include;
Directional selection involves a change in the environment shifts of phenotypes observed. Example is the giraffe neck-length, where the length got longer and longer over time to reach the leaves at the top of trees.
Stabilizing selection , this is a selection where an average phenotype is favored. example is number of eggs laid by birds such that too many eggs will be a waste of energy because some chicks would starve.
Disruptive selection is a selection where individuals with an average value of a trait are affected most while those with values below average are affected least. Example small individuals are capable of hiding from predators while big individuals can not fit in the hiding place but instead will fight with predators.

8 0
3 years ago
A log has a density of .8 g/cm³. This log will _______ in freshwater, which has a density of 1.0 g/cm³ .
m_a_m_a [10]
The log will float on the water because his density is lower than the liquid, so it will stay at the top due to Archimedes' principle.

<span>Archimedes' principle is a physical law that describes the upward force (the vertical thrust) experienced by any body immersed in a fluid (liquid or gas). This force is strongly related to the density of both the fluid and the body.
</span>
You can try the experience at home, by using an object that has a lower density than the water like the sunflower oil, you will see that it will stay at the top of the water too.
7 0
3 years ago
Read 2 more answers
When 10,000 molecules of ATP are hydrolyzed to ADP and i in a test tube, about half as much heat is liberated as when a cell hyd
Korolek [52]

Answer:

C. Reactant and product concentrations in the test tube are different from those in the cell.

Explanation:

Cells convert some of the energy from ATP hydrolysis in to different forms of energy other than heat. ATP energy does not always generate more heat.  Many times, energy is used for different purposes.

4 0
3 years ago
Read 2 more answers
Drag each tile to the correct box
scoundrel [369]
We need the context of the work of you want us to answer
6 0
3 years ago
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