No, but it is known that old/sick prey is much easier to catch. The evidence is that, say, there's no old and sick prey. The predator has to eat regardless, and whatever is there for it to take, it will. Think of a lion and a zebra, and the zebra is eating grass in the middle of a field. The lion is going to take that chance.
An aquatic food chain would be found in earths atmosphere
Hypothesis and Theory are similar because a hypothesis is what you think will happen and theory is what people think does happen.
When water molecules are being made, two hydrogen atoms will make a hydrogen bond with one oxygen atom, making a water molecule.
Salt accumulation in the runoff when the snow melts can cause loss of water from the roots of plants leading to the death of the plants. Sufficient amounts of salt could cause fresh water organisms harm in the same manner.
