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cupoosta [38]
3 years ago
5

Nitrogen is changed from a free gas to a usable form by a process called

Biology
1 answer:
Dimas [21]3 years ago
3 0

Answer:

nitrogen fixation.

Explanation:

Nitrogen fixation is the process by which the combination of molecular nitrogen oxygen or hydrogen is given to give oxides or ammonium that can be incorporated into the biosphere. Molecular nitrogen, which is the majority component of the atmosphere, is inert and not directly usable by most living beings.

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How are babies made?
Reptile [31]

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The genetic material in the sperm combines with the genetic material in the egg to create a new cell that starts dividing rapidly. You're not actually pregnant until that bundle of new cells, known as the embryo, travels the rest of the way down the fallopian tube and attaches itself to the wall of your uterus.

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2 years ago
What is the evolution of life on land means for the future life?<br><br> Please Help!
Neko [114]

Answer: i think more animal

Explanation:

8 0
3 years ago
what do you think earth looked like millions ago? Explain how plants and animals may have been different then from what they are
vitfil [10]

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4 0
3 years ago
PLEASE HELP ASAP!!!!
marin [14]

Answer:

B. Smaller fragments travel faster and farther than larger fragments.

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6 0
3 years ago
Memory cells may take the form of B cells. T cytotoxic cells. T helper cells. All of the choices are correct.
topjm [15]

Answer:

Having considered how an appropriate primary immune response is mounted to pathogens in both the peripheral lymphoid system and the mucosa-associated lymphoid tissues, we now turn to immunological memory, which is a feature of both compartments. Perhaps the most important consequence of an adaptive immune response is the establishment of a state of immunological memory. Immunological memory is the ability of the immune system to respond more rapidly and effectively to pathogens that have been encountered previously, and reflects the preexistence of a clonally expanded population of antigen-specific lymphocytes. Memory responses, which are called secondary, tertiary, and so on, depending on the number of exposures to antigen, also differ qualitatively from primary responses. This is particularly clear in the case of the antibody response, where the characteristics of antibodies produced in secondary and subsequent responses are distinct from those produced in the primary response to the same antigen. Memory T-cell responses have been harder to study, but can also be distinguished from the responses of naive or effector T cells. The principal focus of this section will be the altered character of memory responses, although we will also discuss emerging explanations of how immunological memory persists after exposure to antigen. A long-standing debate about whether specific memory is maintained by distinct populations of long-lived memory cells that can persist without residual antigen, or by lymphocytes that are under perpetual stimulation by residual antigen, appears to have been settled in favor of the former hypothesis.

6 0
2 years ago
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