the answer is a
Explanation:
it's a because 5n time 4 will give u 20n
Nitrogen is a crucially important component for all life. It is an important part of many cells and processes such as amino acids, proteins and even our DNA. It is also needed to make chlorophyll in plants, which is used in photosynthesis to make their food.
Physics is the fundamental (basic) science because all other sciences are derived from Physics.
B because B is showing that polarization would happen since hydrogen bubbles form that way.
B. How many people were included in the study.