Answer:
It allows water and other molecules to enter and exit the system.
Explanation:
Plants have both a cell membrane and a cell wall. These allow needed molecules, such as water, to enter the cell. Both the cell wall and the cell membrane are semi permeable, which means that they choose what can enter and leave the cell. Molecules like water and other useful things to the cell enter it, and things such as waste leave the cell through the membrane and wall.
Remember that only plant cells have cell walls. Animal cells only have a cell membrane. But both the wall and membrane have the same purpose.
The population will later, cease to exist.
Since the population is experiencing (about) the same rates of immigration and emigration, these 2 factors will not change anything.
A low birth rate and a high death rate means that more people are dying than being born.
Therefore the population will decrease until there is nobody and it will cease to exist.
Answer: 2 atoms of hydrogen combined by covalent bods to the same atom oxygen. ( H2O )
Explanation: What is water molecules made of? 2 atoms of hydrogen combined by covalent bods to the same atom oxygen. ( H2O )
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<span>Weight, should be "The force on an object due to its mass and gravity"
hope this helps</span>
