Q.1.How are the alveoli designed to maximise the exchange of gases? Q.2.i) The breathing cycle is rhythmic whereas exchange of gases is continuous process. Justify.

primary succession begins with a bare rock and ends with a forest secondary succession begins after a natural disaster where there is a temporary setback after a forest fire or local destruction, but the surrounding area can fill in

the rocks are classified by the geological process they are formed by. the three main groups of rocks are igneous, metamorphic, and sedimentary. minerals are not they are classified under the chemical classes they are in. these groups include silicates, sulfates and carbonates.