A. C. 5.1 Here you have to describe the two types of specific immunity, cell mediated (T-lymphocytes) and humoral (B-lymphocytes).

A. C. 5.2 This looks at acquired immunity. Once the body has been infected by a microbe the body produces antibodies that help the immune response, these are produced by the B- lymphocytes. However at the same time some of the B-Lymphocytes are stored as B-memory cells so if we are infected again the body has a source B- cells that can quickly produce antibodies. The first infection produces what we call the initial or primary response and the B-memory cells are responsible for the secondary response and we don't suffer as badly the second time we are infected, the term naturally acquired immunity as we have acquired the immunity by being infected. Another type of acquired immunity is called artificial acquired immunity and it acquired

the element that provides strength to the exoskeletons of clams and oysters is phosphorus.

this is so because calcium carbonate is the main component in the shells. calcium carbonate is strengthened by phosphorus.

explanation:

the answer is d.) homologous; have mammary glands

1: most common garden plants prefer loam — soils with a balance of different-sized mineral particles (approximately 40% sand, 40% silt, and 20% clay) with ample organic matter and pore space. however, some plants grow better in sandy soils, while others are well-adapted to clay soils.

2: available water capacity is the maximum amount of plant available water a soil can provide. it is an indicator of a soil's ability to retain water and make it sufficiently available for plant use. available water capacity is the water held in soil between its field capacity and permanent wilting point.

3: it is the same for all living things (plants and animals). it also includes very tiny organisms that our eyes cannot see. they are known as microorganisms, and include viruses, bacteria and fungi.