Answer: The vascular plants are set apart in two main ways: Vascular plants have vascular tissues, which circulate resources through the plant. This feature allows vascular plants to grow to a larger size than non-vascular plants, which lack these specialized conducting tissues and are therefore restricted to relatively small sizes.
I believe this was D but i forgot.
Uranium- lead which is the oldest & one of the most <span>refined of the </span>radiometric dating<span> schemes</span>
D. 2H₂O ⇄ H₃O⁺ + OH⁻
H₂O⁺ is known as the hydronium cation and OH⁻ is known as the hydroxide anion.
T-cells functions in cell-mediated immunity while b-cell functions in humoral immunity .
Hence Option A is correct.
What is cell-mediated immunity?
cell-mediated immunity is an immune response that does not involves antibodies .in this immunity , the specialised T-lymphocytes circulate in blood and tissue and directly attacks antigens .these cells either attack directly the antigens or produce clone of cells which respond to antigens .killer T-cells destroys pathogens and provides cell-mediated immunity. it destroys pathogens cells by secreting lysozymes. it shows its activity at the location of antigen presenting tissue. it has slow response.
What is humoral immunity?
humoral immunity is a type of immunity that mediated by macromolecules including secreted antibodies ,complement proteins ,and certain antimicrobial peptides.in this type the B-lymphocyte produce antibodies in blood and lymph ( known as humors). it protects the body against the invasion of bacteria and viruses into the body by antigen-antibody reactions. antigen specific plasma B-cells provide antibody mediated immunity .it normally causes agglutination and neutralization of foreign antigens. it shows its activity in extracellular fluids. it has fast response upon detection.
T-cells :
It is a part of white blood cell. it is apart of immune system and develop from stem cells in the bone marrow .they help in protection of body from infections and may help fight cancer.it is also called as T-lymphocyte.
B-cells:
It is a type of white blood cell that makes antibodies. B-cells are part of the immune system and develop from stem cells in bone marrow .it is also called as B-lymphocyte.
Hence OPTION A is correct.
Learn more about B-cells and T-cells here
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