Read the passage and answer the questions on the basis of your comprehension: 

The most important distinction between the animal and man is this, that the animal is very nearly bound within the limits of its necessities, the greater part of its activities being necessary for its self-preservation and the preservation of race. Like a retail shop keeper, it has no large profit from its trade of life, the bulk of its earnings must be spent in paying back the interest to its bank. Most of its resources are employed in mere endeavour to live. But man, in life's commerce, is a big merchant. He earns a great deal more than he is absolutely compelled to spend. Therefore there is a vast excess of wealth in man's life, which gives him the freedom to be useless and irresponsible to a great measure There are large outlying tracts, surrounding his necessities, where he has objects that are ends in themselves. The animals must have knowledge, so that their knowledge can be employed for useful purposes of their life. But there they stop. They must know their surroundings in order to be able to take their shelter and seek their food, some properties of things in order to build their dwellings some signs of the different seasons to be able to get ready to adapt themselves to the changes. Man also must know because he must live. But man has a surplus where he can proudly assert that knowledge is for the sake of knowledge. There he has the pure enjoyment of his knowledge because there knowledge is freedom Upon this fund of surplus his science and philosophy thrive.