Question

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Answer 1

Transportation of water molecules takes place through the xylem vessels and that of food takes place through phloem tissues.

Answer 2

because arteries are the first vessels that heart pumps blood through ,they experience the highest blood pressure ,so the have thick elastic walls to withstand the highest pressure

water and minerals can be transported through the xylem tissue .in the xylem tissue vessel and trachide of the root,stem,leaves are inter connected forming a continous system of water cannals  which conduct to reach in all parts of the plant

the way of removal of waste products from body of animal depends on availability of water aquatic animals like fishes excreate cell waste (ammonia)in gaseous form which directly dissolves into water .some land animals like bird ,lizards,snakes excreates a semi-solid white coloured compound caled uric-acid