Answer:
Epigenetics.
Explanation:
Epigenetics is the study of phenotypic changes which are heritable but not related to changes in the DNA sequence. It is influenced by several factors including the environment.
An example of epigenetics is DNA methylation: addition of methyl group to some part of the DNA that prevents that part from being expressed. Other examples include history modifications.
In summary, Epigenetics describes inheritance through other mechanisms than through the DNA sequence.
Friction helps stop a bike when you use the brakes, but it can be harmful by slowing your speed down, if you hit the brakes hard at the sudden moment, you could possibly tumble and or fall. It also causes heat, so if not used correctly, that can be an injury. If you were to fall from the sudden stop, you could possibly hit the ground which can cause a knee injury and or scrapes.
Answer:
less than 7
Explanation:
If the rainwater is always acidic then its pH must be less than 7. pH is a scale which basically means negative log of [H+] or -log[H+] and the range that it covers is from 0 to 14. A substance can be acidic, basic or neutral based on the pH that it has. If the pH of a substance is less than 7 then it means the substance is acidic, if the pH of the substance is more than 7 then it means that the substance is alkaline while a pH of 7 indicates that the substance is neutral.
The chemical formula of ammonium phosphate is (NH4)3PO4. There is 3*4=12 Hydrogen atom in one molecule ammonium phosphate. The total mass of one molecule is (14+4）*3+31+16*4=149. The mass of hydrogen atoms in one molecule is 3*4=12. So the mass percent of hydrogen is 12/149*100%=8.05%
It has a rough appearance because the surface is covered with ribosomes that produce protein. ..... I hope this helps :)
