Answer:
IgM, IgA, IgE, IgD and IgG
Explanation:
IgM functions in the initial response to offence.
IgA is important for protection of mucus membranes such as in saliva, sweat, tears and gastric fluid.
IgE is active during allergic reactions and defense against infections.
IgD is found on the surface of lymphocytes and is activated upon contact with antigens.
IgG forms part of the secondary response to antigen and is also responsible for newborn protection.
The word that goes on to the gap is "cells"
Hope it helped!
Answer:
Observers ahead of the wave observe an apparent increase in wave frequency
Explanation:
This is the Doppler Effect. The frequency of a wave increases when the source approaches the observer and decreases as the source recedes.
B, C, and D are wrong. Observers behind the source notice a decrease in frequency.
Answer:
Full moon and spring tide
Explanation: