Answer:
c. some drug-resistant bacteria were present at the start of treatment, and natural selection increased their frequency
Explanation:
-The number of B cells producing the antibody is proportional to the concentration of that antibody.
-On day 16, one out of 100000 B cells are specific for antigen A
\frac{1}{100000} = 1 x 10⁻⁵ B cells
- on day 16, Antibody concentration is 2 × 10¹= 20 Antibodies
- on day 36, antibody concentration 8 × 10³.= 8000
20 antibodies ------------ 1 x 10⁻⁵ B cells
8000 antibodies--------------x
x= (8000 x 1 x 10⁻⁵)/ 20
x= 4x10⁻³ or 1 in 250 are <span>B cells specific for antigen A</span>
Earths geological plates move because of the intense heat in the earths core
Two methods are used to clear an obstructed airway of an infant.
1. The infant's head and neck is held with one hand firmly supporting its jaw between thumb and fingers. The infant is laid face down over the forearm with head lower then its chest and held firmly between the thighs. Then 5 distinct and separate back blows and administered between the infants shoulder blades with the heel of ones hands.
2. 5 Chest compressions by placing two fingers of one hand on the breast bone just below the nipple line in a manner similar to CPR chest compressions.
Hello,
Question- In a particular species brown fur is dominated over white fur. So how could an individual in the specias have tan fur?
Answer- well there are many possibilities of why that specias has TAN fur it can start from there parents had brown fur till they was standing in the sun for to long or even that there habbitat is different temp.
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