Activation of cellular and humoral immunity occurs during<span> clonal selection, the </span>second phase of the immune response. Migration of the lymphoid cells from the bone marrow to central lymphoid organsoccurs during<span> the first </span>phase of the immune response<span> (generation of clonal diversity)</span>
Given the statement "Most bacteria are heterotrophs." we could say that it is TRUE. Heterotrophs is a<span>n </span>organism<span> that cannot </span>fix carbon<span> and uses </span>organic carbon for growth and can be further divided based on how they obtain energy; if the heterotroph uses light for energy, then it is considered aphotoheterotroph<span>, while if the heterotroph uses chemical energy, it is considered a </span>chemoheterotroph<span>.</span>
Because of immense pressure from the ventricles, the atrioventricular valves (mitral valve and tricuspid valve) remain closed. The blood pressure of the right atrium is 0-8 mmHg and that of left atrium is 4-12 mmHg. The blood pressure of the right ventricle is 15-25 mmHg (systolic) over 0-8 mmHg (diastolic) and that of left ventricle is 110-130 mmHg (systolic) over 4-12 mmHg (diastolic). The blood from the right atrium will flow back to the vena cavae causing leg swelling. The blood from the left atrium will flow back to the lungs causing pulmonary edema.
<span>Ss, Ss, ss, ss will the genotypes formed
So your an
answer is B
hope i helped ;)</span>