b. They show the body virus pieces to prepare it to fight that virus in the future.
Answer:

Explanation:
As we know that the formula for pH is
![pH = -[log H+]\\](https://tex.z-dn.net/?f=pH%20%3D%20-%5Blog%20H%2B%5D%5C%5C)
It is also given in the question that one pH unit represents the 10 fold change in the concentration of hydrogen ion.
Now for lemon juice whose pH is 2, hydrogen ion concentration is equal to

And for pure water whose pH is
, hydrogen ion concentration is equal to

Thus, the H+ ion concentration in lemon juice is
times greater than the pure water.
Answer:
The correct answer is - option b) lipids
Explanation:
Lipids are one of the nutrients that are necessary to the body of an individual organism as it plays role in different ways such as energy storage, cell signaling, component of the cell membrane and many more hat maintain homeostasis in organisms body.
These nutrients are made up of fatty acid and glycerol long chains so these are polymer of glycerol and fatty acid and called triglyceride which provides maximum energy in comparison to other nutrients in need.
Thus, the correct answer is - option B) lipids.
So basically in Prophase 1 you will get a synapsis (pairing) between homologous chromosomes. Followed by this you have what is called the crossing over stage, this is where different sections of the chromosomes are exchanged.
When it comes to cytokinesis in meiosis II, you will have four genetically unique haploid cells, that will have a random combination/mixture of the parental and maternal genes
Determining Evolutionary Relationships. Scientists collect information that allows them to make evolutionary connections between organisms. ... In the case of phylogeny, evolutionary investigations focus on two types of evidence: morphologic (form and function) and genetic.