They turn brown because they begin to decompose..which is why bananas are biodegradeble because they are able to become decomposed by other living things
I think the best medium is agar. It is a jelly-like substance that is obtained from algae, and is used to culture small organisms such as microorganisms and bacteria.
Hope this helps. :)
Chlorophyll is a pigment found in the thylakoid membranes of the chloroplasts in the leaves. This is why plants are green. The simple answer is that plants are green because they have green chloroplasts.
<span> All the millions of different proteins in living things are formed by the bonding of only </span>20 amino acids<span> to make up long polymer chains.</span>
