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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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This graph shows that bird ranges in the winter have been shifting northward over several decades.
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Answer:

1 migration

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Which of the following are importannt in controlling the concentration of body water and electrolytes?
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Kidneys maintain the electrolyte concentrations by filtering the electrolytes and water from blood, returning some to the blood, and excrete Cretingham any excess into the urine

7 0
3 years ago
PLS HELP ASAP<br> how was the first compound microscope different from Leeuwenhoek's microscope
Darya [45]

Answer:

it had more than one lens

Explanation:

The first compound microscope had more than one lens located in the objective and eyepiece. Both the eyepiece lens and objective lens are convex. The compound microscope is used to magnify specimen at high magnification (40 - 1000x), which is achieved by the combined effect of the two sets of lenses.

4 0
4 years ago
Cells of plants and animals have _____________.
Sonbull [250]

Answer:

cell membrane and cell wall

4 0
3 years ago
Cultures of a bacterial species were incubated on the shelf of a refrigerator, out on a lab bench top, on the shelf of a 37°C in
andriy [413]

Answer:

This species are sychrofiles .

Explanation:

Bacteria can be classified according to their optimal growing temperature in:

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