Th memory cells differ from the effector cells in that the memory cells live longer. Two types of cells are produced by the clonal selection, these are the effector cells and the memory cells. Effector cells are relatively short lived activated cells that defend the body in an immune response. Effector B cells are called plasma cells and secrete antibodies, and activated T cells include cytotoxic T cells and helper T cells, which carry out cell-mediated responses. The production of effector cells in response first time exposure to an antigen is called the primary immune response. The memory produced at this time and only become active in case of a re-exposure to the same antigen that stimulated their formation.
Answer:
It's the<u> Trichromatic theory</u>
Explanation:
Answer: b. it takes time for signals to travel all the way to the brain.
Reflex reaction is the instantaneous reaction of the body to the applied external stimuli. This mechanism is present in the body to make it possible to quickly react to situations without putting much effort into thinking and processing the nature of the stimuli. The reflex arc does not include the brain. This is because the brain has to receive signal from the sensory organs through sensory neurons, process it, and send a signal through the motor neuron to the muscles to generate a response. The whole process is time taking and lowers the reaction time of the organism, which can be dangerous in certain situations.
16a + 20 is what it equals, I hope this helps!!
I get why u were confused cause the way they word some of the answers literally doesn't make any mf sense
my best answer would be the 3rd one (sediment that is sorted by size due to the changing velocity of the water)
Explanation:
because when sediments are well sorted their sizes are similar
