The task of the respiratory system is the exchange of Oxygen and Carbon Dioxide within the body; however, the respiratory system alone has no mechanism for the transfer of oxygen from the lungs to the body for absorption and transfer of carbon dioxide from the body for expulsion. The cardiovascular system assists in this by moving oxygen-saturated blood from the lungs to different parts of the body and carbon dioxide rich blood from the body to the lungs.
A true fruit is a ripened ovary that usually starts ripening when it is
fertilized. And vegetable is any vegetative part of the plant which is
edible and contains stored food probably in the form of starch.
These
definitions are not exact as there are a lot of fruits which are fruits
but do not strictly follow the given definition. See Syconus, Composite
fruits, Sorosis.etc
Classification is based on several different
criteria, for example the mode of reproduction, arrangement and design
of flowering parts and flowers and also on the basis of habitat and
habit.
1. Cell wall ( maintain structure and support)
2. centrioles ( aids in cell division)
