Answer:
Explanation: The body mass is a weight of the person. The total surface area of the air sacs means that in an organism who is having air sacs, spaces are present in them In these air sacs there is a presence of air which is constant.
Explanation:
The relationships between the ratios of Hemoglobin total surface area of such conditions result from the available amount of air sacs that permits.
Birds of 21 species with body mass ranging from 8 to 170 g, in eight species of antiracial.
Air sacs are present as small sacs off the bigger respiration tubes (tracheae) of insects, as prolongation of the lungs in birds, and as final organs in the lungs of certain other vertebrates.
They give to increase respiratory efficiency by giving a huge superficial area for gas transportation.
chemicals that are secreted from antigen-presenting cells then activate helper T cells describes the role of cell-to-cell communication during a response to an invasion of antigens.
Explanation: Antibodies are present on the surface of the cells, and binds specifically to antigens and can also engulf pathogen and process these cells presenting them to MHC class 2. This complex is activated by helper T cells to secrete antibodies and macrophages. This interaction of B-cell and MHC class 2 complex with helper T cell is cell-mediated immune response.
