Glucose does not diffuse freely across cell membrane because if it's size
Macrophages engulf foreign material and destroy them using lysozymes.
When presented with antigen by antigen presenting cells, Helper –T cells produce
cytokines that activate B cells and triggers the adaptive immune response. T-helper cells determine the specificity of the adaptive response to an antigen. Cytotoxic-T-cells
destroys infected cells that have displayed an antigen on the MHC I surface receptors.
Suppressor T cells enable negative feedback by downregulating
immunity in cases when a foreign antigen
is eliminated. It also prevents autoimmunity.
Plasma cells are repsosncible for the production of antibodies in the humoral
immune response. Memory B and T cells ensure the immunity can remember an
infectious agent and therefore can launch a faster response in case of re-infection.
Its the second option....................................... :)
This tells you how much he had improved since he was a baby.
Answer: oligotrophic
Explanation:
A newly formed lake is most likely to be oligotrophic. The oligotrophic lake is expected to have high oxygen concentration in water and low organic and inorganic nutrient content. This condition can only support the growth of small number of plants and algae. The overall growth rate of flora and fauna will be low hence, the biodiversity of a region will be low.