This is a tiny fluid-filled cavity in the cytoplasm. it can be used for storage of biochemicals.

Vacuole

Explanation:

Vacuole is an membrane-bound organelle of the plants (some animals, fungi and some bacteria). This fluid-filled organelle contains organic and inorganic molecules, some of them are stored while others are phagocytized and  ready for the excretion. One of the most important function of the plant vacuole is the water storage. Filled with water, vacuole can create turgor pressure which can shape the cell and give it a straight.

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.

after receiving a stimus, the sensory receptors send(s) signals to the appropriate area of the body.  

the must be sensory neurons.  

hope its .