Which of the following components of the immune system form memory cells after you receive a vaccine?

skin and saliva
monocytes and macrophages
neutrophils and histamines
b and t cells

B and T cells.

Explanation:

B cells and T cells are cells of adaptive immune system, which shows specificity, memory, and diversity against pathogens. When a particular antigen enters to the body, it triggers immune responses that activate naive B cells and T cells.

During activation, these cells divide to form 'effector B and T cells' that provide immediate responses against that antigen, and 'memory B and T cells' that provide response against that particular antigen during next or subsequent infections.  

Thus, the correct answer is option). B and T cells.

d concave shape of wave rock

explanation:

the concave shape of wave rock is a very good evidence that supports the evolution of earth due to chemical weathering. if we talk about structure of   wave rock, studies have estimated that it is around 2.7 billion years old. it also serves as the foundation of evidence that it was the place where australian continent began to form.

how the structure of wave rock was created?

studies suggest that structure of wave rock was created when the surrounded area was started to weather due to which deposition of material started on the part of land which now contains wave rock.

the structure of wave rock is considered to be one of the best-known landforms in australia. at the height of around 15 cm, there can be found flared slopes which formulate the margins of hyden rock. it is now assumed by geologists that wave rock was created by subsurface water-induced weathering and not by glaciers, waves or wind.

due to deposition of material over the period of long time, the wave rock became tougher and tougher due to weathering from surrounding terrain. this makes it a physical evidence that supports   the evolution of earth due to chemical weathering.

hope it !

small, big, or no change could occur in the phenotype. it could cause something as simple as a cats ears to curl backwards or something as frighting as death. it could also occur in the protien-coding area and have an effect on that but no effect on the amino acids. what has to occur is a changing in the hox gene or the control gene.