Answer: a cell wall
Explanation: a cell wall is a barrier that protects the plant cell. Animal cells do not need this becuase they have a cell membrane which also protects the cell.
Its A because dolphins like to fallow boats not to be scared
Eutrophication is the excessive richness of nutrients in water bodies where plant growth is at very dense level
Answer:
Four satellites are needed to find your location. GPS's get the signal from satellites and that can calculate the distance you are from those satellites and location. the satellites emit high frequency low power signals that your GPS can pick up.
Explanation:
The molecules in a solid object are packed together, meaning that they are closely together and can’t move freely
