I believe the answer is D.
Answer:
12
Explanation:
Suppose the four different strains are P, Q, R, S. Thus, the first infection can be from any of the four strains and it occurs in 4 ways.
Since an individual cannot be infected again with the strain from which he/she is been previously infected;
Then, at the second time;
The possible number of strain to be infected with = 4-1 = 3 ways
Thus; the number of possible different levels of severity can be viewed by forming two lettered word P, Q, R, and S without repetition which is:
= 4 × 3
= 12
B) All of the listed statements are false.
Explanation:
True statements are:
Matrix of bone is a mixture of calcium salts and phosphate.
Adipose tissue act as the site for energy storage.
Adipose store fats which are potential source of energy.
Cartilage is incapable of extensive repair after severe damage.
The bony matrix can undergo repair and regrowth.
Plasma is the portion of blood that act as the matrix for this tissue type.
Plasma is the fluid component of blood in which the erythrocytes, lymphocytes and thrombocytes lie.
Answer:
an ocean shore
Explanation:
the water and wind erode the sand
