Answer:
Cu can be obtained from
ore
Explanation:
1 kg = 1000 g
So, mass of ore is
= 
Now, 100 g of ore contains 34.63 g of Cu
So,
ore contains
Cu or
Cu.
Answer:
A hydrogen bond is the attractive force between the hydrogen attached to an electronegative atom of one molecule and an electronegative atom of a different molecule. Hydrogen has a partial positive charge.
Explanation:
Not quite sure what you're asking, but I think what you're looking for is 'Native Species'.
Marine food chains at risk of collapse, extensive study of world's oceans finds. ... The acidification of the ocean, where the pH of water drops as it absorbs carbon dioxide, will make it hard for creatures such as coral, oysters and mussels to form the shells and structures that sustain them.