I would go with the cell membrane In this case as the cell membrane is like skin
- Hope you can brainlest this answer
Answer:
i think its d i may be wrong
Explanation:
Isotopes are two atoms with the same number of protons, but a different number of neutrons. Because they have the same number of proton they are atoms of the same element, but with different masses.
so, the answer is c.
i hope this will help you
3Na2O(at) + 2Al(NO3)3(aq) —> 6NaNO3(aq) + Al2O3(s)
This is a double replacement reaction and NaNO3 is aqueous because Na is an alkali metal, plus nitrate is in the solution. Both of these are soluble. Al2O3 is not soluble because it does not contain any element that is soluble and is hence the precipitate.
Hope this helped!
Number 1 is Comets and asteroids
Number 2 is Comets are made of ice and rock
Number 3 is Meteor