E10 In the framework of studying the immune memory, some mice were injected twice by sheep
red blood cells (SRBC). In the spleen, the number of B lymphocytes is measured after each
injection. Results are shown in the document below.
Number of B lymphocytes anti-SRBC
Number of B lymphocytes anti-SRBC
900 000
700 000
500 000
300 000
100 000
-
Time
(in days)
8
Time
(in days)
0
2
4
6
30
32
34
36
38
40
42
First injection of SRBC
Second injection of SRBC
1 - Specify the nature of the immune response triggered against SRBC.
2- Indicate the mode of action of B lymphocytes against SRBC.
3- Draw a comparative table between the 1st and the 2nd injection in relation to the date of
the injection of SRBC, the time of appearance of BL anti-SRBC, the maximum number of
BL, and the duration of their presence in the body.
4. Determine the characteristics of the secondary response.​

C- a hypothesis or d- an observation

answer: carbon 14 can only be used to determine the age of the organisms that were once living, and igneous rocks are non living.

explanation:

carbon 14 dating is used to determine the age of the sample by estimating the amount of carbon 14 present in the sample and then comparing it with a reference standard.carbon 14 is a isotope of carbon which is radioactive and unstable. carbon 14 is assimilated by all plants and animals throughout their life from carbon dioxide. however, one the organisms die they stop this assimilation and the carbon 14 content starts to decrease.by knowing how much of carbon 14 is left in an organism after his death, one can estimate the age of the organism. the materials whose age can be estimated by carbon 14 method are the organic compounds. however, some inorganic compounds such as aragonite   shell can also be dated.however, if we consider the igneous rocks it is a non living component which never accumulated carbon 14 in it and thus, we cannot use carbon 14 dating method to estimate its age.

Iguess i would say diagrams would be most difficult subject too correct