What are t cells and b cells?
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a. lymphocytes
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b. pathogens
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c. antibodies
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d. antigens

Lymphocytes.

Explanation:

Lymphocytes are type of White blood Cells.These are classified as  T- lymphocyte, B-lymphocyte and Natural killer cells.Bone marrow is the site of production and maturation of B-lymphocyte.They are the only cells that can produce antibody.These also differentiate to form memory cells and result in adaptive immune response.The site of T-lymphocyte production is bone marrow and the site of their maturation is the thymus. T-cells do not produce antibodies but destroy Antigen presenting cells, cancerous cells virus infected cells etc.

Lipid because of the high percentage of carbon to carbon bonds, which store more energy than other bonds.