Answer:
Cells do not generally allow such materials to go in because they are having a cell membrane outside. The cell membrane only allows the materials which are required for the growth of the cell such as water and minerals.
Answer: representative data
When designing an experiment a benefit of larger sample sizes would be more representative data. This larger sample size would lead to perfect result.
Answer:
Explanation:
These proteins, known as growth factors, are signals that stimulate cellular functions such as growth, proliferation, healing and differentiation. In the developing human spinal cord, BMPs are required for the formation of neurons.
For protection from the outside elements & harmful insects I would assume. Unless that's already obvious & they wanted a more in-depth answer.
