Following graph shows biome distribution with respect to annual temperature and precipitation:

How many statements are correct among the following:-

(1) The productivity and distribution of plants is also heavily dependent on water.

(2) Some organisms are tolerant a wide range of salinities called euryhaline while others are restricted to a narrow range called stenohaline.

(3) Mammals of colder climates generally have shorter ears and limbs to minimise heat loss, this is called the Allen's Rule.

(4) If the age distribution is plotted for the population, the resulting structures is called an average pyramid