The types of nutrients that cause problems in a marine environment often come from fertilizer run-off. provide a logical argument for why fertilizer is good on land but not in the ocean.

Algae blooms and the rapid proliferation of photosynthetic plankton are the consequence of eutrophication. Eutrophication is a response of an ecosystem to the excess of nutrients which comes from fertiliser run-off. Algae and photosynthetic plankton use the presence of increased nutrients and enhance their own growth. It is known that they produce an oxygen in the photosynthesis, so it is not a problem while they are still alive. But when these organisms die, their decomposition begins. For the process of decomposition, the oxygen is needed and ultimately it will be depleted from a body of water. This will lead to the death of aquatic animals that depend on oxygen.

1. dermis

2. chemical

3. urine

4. viruses

5. antibodies

the correct answer is option b

behavioral response need communication and thus co-ordination at several levels such as interaction among cells, organ system and the entire organism.

behavioral response produces both internal and environmental stimulus.