Explanation:
under what circumstance does a negative cell presents An antigen to another negative cell
Answer:
Qualitative observation is an observation in which the apperance of something is described using descriptive language
Explanation:
Qualitative observation is done to test the quality or purity of a substance being examined.
Qualitative observation is based on nonnumerical information.Qualitative analysis helps us to study whether a particular functional group,ion or atom is present or absent in a given sample.
<h2>Resilience of bone</h2>
Explanation:
The resilience of bone comes from sacrificial bonds in or between collagen molecules
- Three major functions of bones includes
Providing structural support to the body
Providing protection to vital organs
Providing an environment for marrow (where blood cells are produced)
- There are two types of tissues which bones are composed of:
A hard outer layer called cortical bone which is strong, compact,dense and tough
A spongy inner layer called trabecular bone,this network of trabeculae is lighter and less dense than compact bone as a storage area for minerals (such as calcium)
- Bone is also consists of:
Bone forming cells (osteoblasts and osteocytes)
Bone resorbing cells (osteoclasts)
Non mineral matrix of collagen and noncollagenous proteins (osteoid)
Inorganic mineral salts deposited within the matrix
- Bone ends up being a good example of resilience because it is not static like it is perceived to be
