What is the role of B cells in the human immune system? A) the production of antibodies B) the destruction of lymphocytes C) the production of white blood cells D) movement to the thymus gland to build T cells

i believe its A. the production of antibodies

Explanation:

i believe its A  because  B cells are Part of the adaptive immune system, B cells that are responsible for generating antibodies and fighting infections. They are mainly involved with antibody production. They can develop into plasma cells, which produce the most antibodies. They can develop into either plasma or memory cells, and are made in the bone marrow.

i hope this helps ! please mark mark this as brainliest if it did

9.9 years

a = p(1 + rt) . . account balance after time t at rate r starting with principal p

3000 = 2500(1 + 0.0202t) . . filling in the given numbers

1.2 = 1 + 0.0202t . . divide by 2500

0.2 = 0.0202t . . . subtract 1

0.2/0.0202 = t ≈ 9.901

it will take about 9.9 years for the account balance to reach $3000.

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]