Answer:
D
Explanation:
Lymphocytes are the second line of defence
First line of defence indiscriminately defends against all pathogens unlike secondary response which is targeted. First line of defence refers to the external body components like skin, secretions from the body in the alimentary canel
Mucus traps pathogens. Stomach acid kills pathogens
One of the most abiotic factor that may affect humans directly is waster availability because with out water we can get dehydrated and die.
Answer:
6
Explanation:
To find the mean of a data set, add all the values in the set together, and then divide the result by the number of values in the set.
3 + 2 + 2 + 12 + 6 + 5 + 14 + 4 = 48
There are 8 values in the data set.
48/8 = 6
So the mean of the data set is 6.