The proteins are found around the holes and help move molecules in and out of the cell.
Theories may change over time. Unversal laws are supposed to not change.
Most theories and laws cannot not be definetly proved and they are constantly tested.
Consensus is not necessary. Many theories were discarded by the majority of scientific community before been accepted.
Both theories and laws must be based on scientific method and observations are a key part of it. Then, in my opinion, the true statement is that both are supported by observartios.
A six year old child need approximately 850 calories a day.
Six year olds have a special nutritional needs due to the fact that they are growing and developing neurologically at a very rapid rate. Providing a 6-year old with a well-balanced diet full of fruits, vegetables, whole grains and low fat meats and dairy will help them meet the nutritional needs without consuming unnecessary calories.
A. prenatal stage of a human up to 8 weeks of development after fertilization