Complex molecules are made up of other elements bonded with carbon. Carbon is able to bond with other molecules so easily because it has four valence electrons.
Answer:
The first cause of eutrophication is the increase level of nutrients in water.
Explanation:
Then the other effect follow:
1.- Nutrients promote more phytoplanckton at the surface of the body water.
2.- phytoplancton die and settle down at the bottom.
3.- since in the bottom there is no much more sun, the algae at the bottom start to die, plus the phytoplacton that is falling, the sediment at the bottom start to grow.
4.- Since there is any living thing that can produces oxygen in water( it produces hypoxic conditions), other living things start to die.
Correct answer is B!
--------------------------------
If you see meaning of "Unconditioned stimulus", you will see the right answer, firstly what does "Unconditioned Stimulus" means, it means any stimulus that naturally evokes a specific response; see also conditioning. If I would go with choices I would choose correct answer B.
--------------------------------
<em>Hope this helps!</em>
<em />
<u>Brainliest would be great!</u>
<u />
--------------------------------
I COULD BE WRONG, IF I'M PLEASE CORRECT ME!
--------------------------------
<em><u /></em>
<em><u>With all care,</u></em>
<em><u>07x12!</u></em>
I think it would be to exchange gases. When you think about it, plants in the past were always underwater. They didn't have any air. Now, they are on land and need to be able to exchange gases from the leaves to the roots.
