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horsena [70]
3 years ago
14

Why are nitrogen-fixing bacteria important in ecosystems?

Biology
1 answer:
prohojiy [21]3 years ago
3 0
Bacteria that change nitrogen gas from the atmosphere into solid nitrogen usable by plants are called nitrogen-fixing bacteria. These bacteria are found both in the soil and in symbiotic relationships with plants.
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Humoral immunity involves ________ cells and ___________
jarptica [38.1K]

Answer:

Humoral immunity involves <u>B cells</u> and<u> recognize antigens or pathogens in the lymph or blood.</u>

Explanation:

Humoral immunity is defined as the immunity which is mediated by several macromolecules presnet in the extracellular fluids such as antibodies, certain antimicrobial peptides, and  complement proteins.

Humoral immunity allows to distinguishes two groups of foreign substances. it involves <u>B cells</u> and<u> recognize antigens or pathogens in the lymph or blood. </u>

Humoral immunity begins when an antigens bind to B cells.  Interleukins or helper T cells provides a secondary signal to the B cells that activates a B cell and allows B cell proliferation.  which roduces produce plasma cells. The plasma cell then produces antibodies which are identical to the specific antigen. The antibodies are the released and circulate through the body, binding to antigens.  B cells the further produces memory cellss for future immunity.

So, Humoral immunity involves <u>B cells</u> and<u> recognize antigens or pathogens in the lymph or blood.</u>

8 0
3 years ago
What does BAC stand for
Alenkasestr [34]

Answer:

blood alcohol concentration

Explanation:

we studied that recently so I could recall

5 0
3 years ago
In what ways is N2 gas removed from the atmosphere
Juliette [100K]

Answer:

Nitrogen is removed from the atmosphere mainly by nitrogen-fixing bacteria in the soil and oceans (blue-green algae).

Explanation:

Nitrogen is removed from the atmosphere mainly by nitrogen-fixing bacteria in the soil and oceans (blue-green algae).

6 0
3 years ago
A gel-like substance enclosed by the cell membrane that contains th cells organelles
almond37 [142]
The answer is cytoplasm 
cytoplasm is a gel in the cell and contains the cells organelles :)))
i hope this is helpful
have a nice day 
4 0
3 years ago
A potential source of confusion in constructing a phylogeny tree is similarity between organisms that is due to:.
jok3333 [9.3K]

 convergent evolution - called analogy

a potential source of confusion in constructing a phylogeny is similarity between organisms that is due to convergent evolution - called analogy - rather than to shared ancestry. thus for mammals, the backbone is a shared ancestral character, a character that originated in an ancestor of the taxon

6 0
2 years ago
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