B cells mature in the bone marrow, which is at the core of most bones It recognises invaders by the shape of molecules -antigens- on their surfaces. With the help of T cells, B cells make proteins called antibodies. The antibodies will help your body become aware of intruders.
The correct option is this: PLANTS CAN BE USED TO MAKE MATERIALS.
Plants are very important living organisms and they can be used in diverse ways. Some plants can be used as foods, some plants are used as raw materials for making pharmaceutical drugs and other herbal products. Plants, such as cotton are used to make clothing materials and dead and decaying plants serves as fertilizer that add nutrients to the soil.
Carbohydrates dissolve in water and lipids don't. Explain how the bonding properties of carbon atoms result in the large variety of carbon-based molecules in living things<span>. </span>Carbon atoms<span> are able to form 4 </span>types<span> of covalent bond which ends up as molecules</span><span>.</span>
